1. Creswell, J. W., & Plano Clark, V. L. (2011). Designing and conducting mixed methods research. Thousand Oaks: Sage.
2. Deardon, J. (2014). English as a medium of instruction: A global phenomenon. London: British Council. Retrieved September 30, 2016, from
https://www.britishcouncil.org/sites/default/files/e484_emi_-_cover_option_3_final_web.pdf
.
3. Dietel, R. J., Herman, J. L., & Knuth, R. A. (1991). What does research say about assessment? Oak Brook: NCREL.
4. Field, J. (2009). Listening in the language classroom. Cambridge: Cambridge University Press.
5. HEA. (2012). A marked improvement: Transforming assessment in higher education. Available at:
https://www.heacademy.ac.uk/system/files/a_marked_improvement.pdf
. Last accessed 26 Feb 2018.