Additional bibliography for study
Lightbown, Ρ.Μ. and Spada Ν. 2006. How languages are learned. Oxford: Oxford University Press.
Dulay, H., Burt, M. and Krashen, S. 1982. Language two. Oxford: Oxford University Press. (Chapter 3: Internal processing, Chapter 4: Effects of personality & age, Chapter 5: The role of the first language)
Gass, S. and Selinker, L. 2008. Second language acquisition: An introductory course. New Jersey: Lawrence Erlbaum. (Chapter 4: The role of the native language: an historical overview)
Krashen, S. D. 1985. The input hypothesis: Issues and implications. New York: Longman. (Chapters 1 & 2).
Selinker, L. 1992. Rediscovering interlanguage. London: Longman. (Chapter 1: Beginnings: Fries, Lado, Chapter 2: Towards Interlanguage: Uriel Weinreich)