References :

Hymes, D. H. (1971). On communicative competence. Philadelphia, PA: University of Pennsylvania Press.

Mason, A. (2011). Teaching languages online. Open Learning, 26(3), 275–280. http://doi.org/10.1080/02680513.2011.611688

Tharp, R. G., & Gallimore, R. (1991). The Instructional Conversation: Teaching and Learning in Social Activity. Center for Research on Education, Diversity & Excellence. Retrieved from http://escholarship.org/uc/item/5th0939d