References

• Oxford,R. (2002) Sources of Variation in Language Learning. In R. Kaplan (Ed.) Handbook of Applied Linguistics. Oxford University Press.

• Richards, J. and Schmidt, R. (2002) (Ed.) Longman Dictionary of Language Teaching and Applied Linguistics. Longman, Pearson Education.

• Spada, N. and Lightbrown, P. (2006) Individual Differences in Second Language Learning. (Ed.)How Languages are Learned. Oxford University Press.