Brown, H. D. (2001). Teaching by principles: An interactive approach to language pedagogy (2nd Ed.) NY: Longman.
Harmer, J. (2007). How to teach English. Pearson, Essex: Longman.
Hedge, T. (2008) Teaching and learning in the language classroom. Oxford: Oxford University Press.
Hinkel, E. (2006). Current perspectives on teaching four language skills. TESOL Quarterly, 40 (1), 109-131.