Aktürk-Drake, Memet. (2015). Phonological adoption through bilingual borrowing: Comparing elite bilinguals. PhD dissertation, University of Stockholm.
Ammerlaan, Ton. (1996). ‘You get a bit wobbly…’. Exploring bilingual lexical retrieval processes in the context of First Language Attrition. PhD dissertation, University of Nijmegen.
Badstübner, Tina. (2011). L1 attrition: German immigrants in the U.S.  PhD dissertation, University of Arizona at Tuscon.
Baladzhaeva, Liubov. (2013). L1 attrition without L2 acquisition: A case of Russian-speaking immigrants in Israel. MA dissertation, University of Haifa.
Baldursdóttir, Bergljót. (1984). Language Shift in an Icelandic Child: A Longitudinal Case Study of Language Attrition. MA dissertation, Lancaster University.
Beganović, Jasminka. (2006). First language attrition and syntactic subjects : a study of Serbian, Croatian, and Bosnian intermediate and advanced speakers in Dutch. MA Thesis, University of Edinburgh.
Ben-Rafael, Miriam. (2001). Contact de Langues: le français parlé des francophones israéliens. PhD dissertation, University of Tel Aviv.
Bergmann, Christopher. (2017). Facets of native-likeness. First-language attrition among German emigrants to Anglophone North America. PhD dissertation, University of Groningen. This thesis has been published as a series of papers:
    • Bergmann, C., Sprenger, S. A., & Schmid, M. S. (2015). The impact of language co-activation on L1 and L2 speech fluency. Acta psychologica, 161, 25-35.
    • Bergmann, C., Meulman, N., Stowe, L. A., Sprenger, S. A., & Schmid, M. S. (2015). Prolonged L2 immersion engenders little change in morphosyntactic processing of bilingual natives. NeuroReport, 26(17), 1065-1070.
    • Bergmann, C., Nota, A., Sprenger, S. A., & Schmid, M. S. (2016). L2 immersion causes non-native-like L1 pronunciation in German attriters. Journal of Phonetics, 58, 71-86.
Bolonyai, Agnes. (1999). The hidden dimension of language contact: The case of Hungarian-English bilingual children. PhD dissertation, University of South Carolina. Most US dissertations can be ordered from ProQuest UMI dissertation services.
Bortolato, Claudia. (2013). Language maintenance-attrition among generations of the Venetian-Italian community in Anglophone Canada. PhD dissertation, University of Exeter.
Bylund, Emanuel S. (2008). Age Differences in First Language Attrition. PhD dissertation, Stockholm University. This thesis has been published as a series of papers:
      • Bylund, E. (2009). Maturational constraints and first language attrition.  Language Learning 59(3): 687-715.
      • Bylund, E. (2009). Effects of age of L2 acquisition on L1 event conceptualization patterns.  Bilingualism: Language and Cognition 12: 305-322.
      • Hyltenstam, K., Bylund, E., Abrahamsson, N. & Park, H-S. (2009). Dominant language replacement; The case of international adoptees.  Bilingualism: Language and Cognition 12 (2): 121-140.
      • Bylund, E., Abrahamsson, N., & Hyltenstam, K. (2010). The role of language aptitude in first language attrition: The case of pre-pubescent attriters.  Applied Linguistics  31 (3): 443-464
Cai, Bingxin. (2021). An investigation of the maintenance and attrition of the ba-construction by native speakers of Chinese in the UK . PhD dissertation, University of Essex.
Calvo Capilla, M. Carolina. (2016). La atrición en las lenguas de contacto: el caso de los inmigrantes españoles en Brasil. PhD dissertation, Complutense University of Madrid.
Cao, Xiangjie. (2016). Native Language Tone Attrition in Mandarin Among Late Bilinguals. PhD dissertation, University of Newcastle.
Chang, Charles B. (2010). First Language Phonetic Drift During Second Language Acquisition. PhD dissertation, University of California, Berkeley.
Chang, Yufen. (2012). First language attrition: an investigation of Taiwanese tones and tone Sandhi. PhD dissertation, Indiana University. This dissertation can be ordered here.
Cherciov, Mirela. (2011). Between acquisition and attrition: the dynamics between two languages in adult migrants. PdD dissertation, University of Toronto.
Cojocaru, Claudia. (2021). Multilingualism and Language Policies in the British Foster Care System. MA dissertation, University of Essex.
Crezee, Ineke H. M. (2008). I understand it well, but I cannot say it proper back: language use among older Dutch migrants in New Zealand. PhD dissertation, University of Auckland.
Datta, Hia. (2010). Brain bases for first language lexical attrition in Bengali-English speakers. PhD dissertation, City University of New York.
Dostert, Susan. (2009). Multilingualism, L1 attrition and the concept of 'native speaker' . PhD dissertation, Heinrich-Heine Universität Düsseldorf.
Engstler, Caroline. (2012). Language Retention and Improvement after a Study Abroad Experience . PhD dissertation, Northwestern University.
Flores, Cristina. (2008). A competência sintáctica de falantes bilingues luso-alemães regressados a Portugal : um estudo sobre erosão linguística. University of Minho. Unpublished PhD thesis. The results from this study have been published in articles, among them:
      • Flores, C. (2010). The effect of age on language attrition: Evidence from bilingual returnees.  Bilingualism: Language and Cognition 13(4): 533-546.
      • Flores, C. (2012). Differential effects of language attrition in the domains of verb placement and object expression.  Bilingualism: Language and Cognition 15(3): 550-567.
Gamage, Stephen. (2021). Factors contributing to the attrition of the Polish nominal declension system in Polish immigrants. BA dissertation, University of Sheffield, UK.
Gharibi, Khadijeh. (2016). Incomplete Acquisition, Attrition and Maintenance of Heritage Speakers’ Family Language: Iranians in New Zealand. PhD dissertation, Victoria University Wellington, New Zealand.
Gross, Steven. (2000). The role of abstract lexical structure in first language attrition: Germans in America. PhD dissertation, University of South Carolina. Most US dissertations can be ordered from ProQuest UMI dissertation services
Gürel, Ayşe. (2002). Linguistic characteristics of second language acquisition and first language attrition: Turkish overt versus null pronouns. PhD dissertation, McGill University Montréal. Can be obtained from the McGill Linguistics Thesis Series.
Hulsen, Madeleine. (2000). Language loss and language processing. Three generations of Dutch migrants in New Zealand. PhD dissertation, Katholijke Universiteit Nijmegen A summary and contact details for the author can be found here.
Isurin, Ludmilla. (2000). Mechanisms of first language forgetting. PhD dissertation, Louisiana State University. Most US dissertations can be ordered from ProQuest UMI dissertation services.
Iverson, Michael. (2012). Advanced language attrition of Spanish in contact with Brazilian Portuguese. PhD Dissertation, University of Iowa.
Jamai, Abdeslam. (2008). Language Use and Maintenance among the Moroccan Minority in Britain. PhD dissertation, University of Salford.
Kan, Rachel Ting Yan. (2018). Development of Cantonese as a heritage language in children Experiments in phonology and morphosyntax. PhD Dissertation, University of Essex.
The results from this study have been published in the following articles:
      • Kan, R. T., & Schmid, M. S. (2019). Development of tonal discrimination in young heritage speakers of Cantonese. Journal of Phonetics, 73, 40-54.
        This article is Open Access.
      • Kan, R. T. (2019). Production of Cantonese classifiers in young heritage speakers and majority language speakers. International Journal of Bilingualism, 23(6), 1531-1548.
Kang, Sang-Gu. (2011). English attrition in Korean-English bilingual children. PhD dissertation, University of Hawai'i at Manoa.
Karayayla, Tuğba. (2018).  Turkish as an immigrant and heritage language in the UK: Effects of exposure and age at onset of bilingualism on grammatical and lexical development of the first language . PhD dissertation, University of Essex.
Kasparian, Kristina. (2015). The Case of the Non-native-like First-Language:
Neurophysiological Investigations of First-Language Attrition and Second-Language Processing. PhD Dissertation, McGill University, Montreal.
The results from this study have been published in the following articles: