1. Burleson, B. (2009). The nature of interpersonal communication: A message-centered approach. In C. Berger et al. (Eds.), The handbook of communication science (pp. 145–165). London: Sage Publication Inc.
2. Canale, M., & Swain, M. (1981). A theoretical framework for communicative competence. In A. S. Palmer, P. G. Groot, & S. A. Trosper (Eds.), The construct validation of tests of communicative competence (pp. 31–36). Washington, DC: TESOL.
3. CEFR. (2011). All scales and all skills. Available from
http://ebcl.eu.com/wp-content/uploads/2011/11/CEFR-all-scales-and-all-skills.pdf
.
4. Chappuis, J. (2015). Seven strategies for assessment for learning (2nd ed.). Portland: Pearson Education.
5. Ellis, R. (1989). Second language learning and second Language learners: Growth and diversity. TESL Canada Journal, 7(1), 74–94.