Lakhoua, H. K., M. A. Lakhoua, and K. B. Kahla. “Key Factors of Successful E-CRM for Optimization of Working in Front Office”. The International Journal of Business & Management, vol. 4, no. 3, Mar. 2016, https://www.internationaljournalcorner.com/index.php/theijbm/article/view/126289.