1. ACTFL. (2012). ACTFL proficiency guidelines 2012. Retrieved from
http://www.actfl.org/publications/guidelines-and-manuals/actfl-proficiency-guidelines-2012
2. Anastasi, A., & Urbina, S. (1997). Psychological testing. Upper Saddle River, NJ: Prentice Hall.
3. Bachman, L. F. (2000). Modern language testing at the turn of the century: Assuring that what we count counts. Language Testing, 17(1), 1–42.
http://dx.doi.org/10.1177/026553220001700101
4. Bachman, L. F. (1990). Fundamental considerations in language testing. Oxford, England: Oxford University Press.
5. Bachman, L. F., & Palmer, A. (1996). Language testing in practice: Designing and developing useful language tests. Oxford, England: Oxford University Press.