Tan, V., F. Quoquab, F. S. Ahmad, and J. Mohammad. “Effect of Self-Esteem on Customer Citizenship Behaviours Among International University Branch Campus Students”. International Review of Management and Marketing, vol. 6, no. 3, July 2016, pp. 467-75, https://www.econjournals.com/index.php/irmm/article/view/2337.