1. Wilcox M. J., Murphy K. M., Bacon C. K., Thomas S., Improving Language Teaching Practice in Preschool Classroom (Arizona State University, Arizona, 2001)
2. Borg W. R., Gall M., Educational research: An introduction fourth edition (Longman, New York & London, 1983)
3. Hyland K., Second language writing (CUP, New York, 2003)
4. Harmer J., The practice of English language teaching (Essex, Pearson Education Ltd., 2007)