1. Bold, M. (2001). University of North Texas Center for Parent Education. Retrieved from < http://www.unt.edu/cpe/module3blk2survey2.htm.>, May 16, 2004.
2. Carroll, J. (1963). A model of school learning. Teachers College Record, 64, 723–733.
3. Carroll, J. B. (1964). Language and thought. Englewood Cliffs, NJ: Prentice Hall.
4. Carroll, J. B. (1981). Twenty-five years of research on foreign language aptitude. In K. Diller (Ed.), Individual differences and universals in language learning aptitude (pp. 83-118). Rowley, MA: Newbury House.
5. Carroll, J. B., & Sapon, S. M. (1959). Modern language aptitude test (MLAT). New York: The Psychological Corporation.