YaronMatras. Language Contact. Cambridge University Press, 2009. 366 pp. ISBN 978-0-521-82535-1hardback978-0-521-53221-1paperback . [Cambridge Textbooks in Linguistics].
Grosjean, F.2001. “The Bilingual’s Language Modes”. In One Mind, Two Languages, J. L. Nicol (ed), 1–22. Oxford: Blackwell.
Heine, B. and Kuteva, T.2005. Language Contact and Grammatical Change. Cambridge: Cambridge University Press.
Hyltenstam, K. and Abrahamsson, N.2003. “Maturational constraints in second language acquisition”. In Handbook of Second Language Acquisition, C. J. Doughty and M. H. Long (eds), 539–588. Oxford: Blackwell.
Kranich, S.2008. The progressive in Modern English. A corpus-based study of its grammaticalization and related changes. Doctoral Thesis, Freie Universität Berlin.
Lenneberg, E. H.1967. Biological Foundations of Language. New York: Wiley and Sons.
Polinsky, M. and Kagan, O.2007. “Heritage Languages: In the ‘Wild’ and in the Classroom”. Language and Linguistics Compass 1/5: 368–395.