1. Bandura, A. (1977). Social learning theory. New Jersey: Prentice Hall Pearson Education.
2. Gagne, R. (1985). The Conditions of Learning (4th ed.). New York: Holt, Rinehart & Winston.
3. Kazdin, A. E. (1977). The token economy: A review and evaluation. New York: Plenum Press.
4. MacIntyre, P. D. & Charos, C. (1996). Personality, attitudes, and affect as predictors of second language communication. Journal of Language and Social Psychology, 15, 3-26.
5. MacIntyre, P. D., Clément, R., Dörnyei, Z. & Noels, K.A. (1998). Conceptualizing willingness to communicate in a L2: A situational model of L2 confidence and affiliation. Modern Language Journal, 82, IV, 545-562.
6. Malott, R. & Trojan-Suarez. (2006). Principles of Behaviour. New Jersey: Pearson Prentice Hall.
7. Matson, J. L., & Boisjoli, J. A. (2009). The Token Economy for Children with Intellectual Disability and/or Autism: A Review. Research in Developmental Disabilities, 30, 240-248. https://doi.org/10.1016/j.ridd.2008.04.001
8. McClelland, D. C. (1987). Human Motivation. UK: Cambridge University Press.
9. Mcleod, S. A. (2007). Skinner – Operant Conditioning. Retrieved from http://www.simply psychology.org/operant-conditioning.html
10. Miltenberger, R. (2008). Behavior Modification. California: Wadsworth Publishing
11. Nevid, J. (2013). Psychology: Concepts and Applications. Belmont, CA: Wadworth.
12. Reeve, J. (2015). Understanding motivation and emotion (6th ed.) Hoboken, NJ: Wiley.
13. Skinner, B. F. (1938). The Behavior of Organisms: An Experimental Analysis. New York: Appleton-Century. http://dx.doi.org/10.1901/jeab.1988.50-277
14. Skinner, B. F. (1953). Science and Human Behavior. New York: The Free Press. http://dx.doi.org/ 10.1901/jeab.2003.80-313
15. Tan, K. H. & Chee, K. M. (2021). Exploring the Motivation of Pupils towards the Implementation of QR Codes in Pronunciation Learning. Academic Journal of Interdisciplinary Studies 10(1), 204-213. https://doi.org/10.36941/ajis-2021-0018