Carroll, S.E. (1989). Language acquisition studies and a feasible theory of grammar. Canadian Journal of Linguistics, 341, 399–418.
Clahsen, H. (1982). Spracherwerb in der Kindheit: Eine Untersuchung zur Entwicklung der Syntax bei Kleinkindern. Tübingen: Narr.
Clahsen, H., & Muysken, P. (1986). The availability of universal grammar to adult and child learners: A study of the acquisition of German word order. Second Language Research, 21, 93–119.
Flores, C. (2008). A competência sintáctica de falantes bilingues luso-alemães regressados a Portugal: Um estudo sobre erosão linguística. Ph.D. dissertation, Universidade do Minho, Braga.
Flores, C. (2010). The effects of age on language attrition: Evidence from bilingual returnees. Bilingualism: Language and Cognition, 131, 533–546.
Hyltenstam, K., & Abrahamsson, N. (2003). Maturational constraints in second language acquisition. In C. Doughty, & M.H. Long (Eds.), Handbook of second language acquisition (pp. 539–588). Oxford: Blackwell.
Kroffke, S., Rothweiler, M., & Babur, E. (2007). Turkish-German successive bilingual children: Age of onset and the development of German V2. Paper presented at the 6th International Symposium on Bilingualism, Hamburg, May 2007.
Meisel, J.M. (1990). Infl-ection: Subjects and subject-verb agreement. In J.M. Meisel (Ed.), Two first languages: Early grammatical development in bilingual children (pp. 237–298). Dordrecht: Foris.
Meisel, J.M. (2011). First and second language acquisition: Parallels and differences. Cambridge: Cambridge University Press.
Meisel, J.M. (2013a). Sensitive phases in successive language acquisition: The critical period hypothesis revisited. In C. Boeckx, & K. Grohmann (Eds.), Handbook of biolinguistics (pp. 69–85). Cambridge: Cambridge University Press.
Meisel, J.M. (2013b). Heritage language learners: Unprecedented opportunities for the study of grammars and their development?Theoretical Linguistics, 391, 225–236.
Sopata, A. (2009). Erwerbstheoretische und glottodidaktische Aspekte des frühen Zweitspracherwerbs: Sprachentwicklung der Kinder im natürlichen und schulischen Kontext. Poznań: Wydawnictwo Naukowe UAM.