Ghani, M. A., A. Othman, N. A. Ibrahim, and W. Z. Wan Ismail. “Relationship Marketing Practices and Effects on Marketing Effectiveness: An Empirical Insight from the Hotel Industry”. International Review of Management and Marketing, vol. 6, no. 4, Oct. 2016, pp. 1026-33, https://econjournals.com/index.php/irmm/article/view/2950.