American Council on the Teaching of Foreign Languages (ACTFL). Retrieved October 20, 2014 from www.actfl.org

Blake, R. J. (2013). Brave new digital classroom: Technology and foreign language learning (2nd edn). Washington, DC: Georgetown University Press.

Brown, J. D. (1995). The elements of language curriculum: A systematic approach to program development. Boston, MA: Heinle & Heinle Publishers.

Gass, S. M., Behney, J., & Plonsky, L. (2013). Second language acquisition: An introductory course. New York, NY: Routledge/Taylor and Francis Group.

Krashen, S. (1985). The input hypothesis: Issues and implications. London: Longman.

Long, M. (1996). The role of the linguistic environment in second language acquisition. In W. C. Ritchie & T. K. Bhatia (Eds), Handbook of second language acquisition, 413–468. San Diego, CA: Academic Press. http://dx.doi.org/10.1016/b978-012589042-7/50015-3

Richards, J. C., & Rodgers, T. S. (2001). Approaches and methods in language teaching. Cambridge: Cambridge University Press. http://dx.doi.org/10.1017/CBO9780511667305

Schmidt, R. W. (1990). The role of consciousness in second language learning. Applied Linguistics, 11 (2), 129–158. http://dx.doi.org/10.1093/applin/11.2.129

Swain, M. (1995). Three functions of output in second language learning. In G. Cook & B. Seidlhofer (Eds), Principle and practice in applied linguistics, 125–144. Oxford: Oxford University Press.