قاسم سامر, السكري أحمد, and دبس يامن. “The Role Of Direct Marketing In Improving Customer Satisfaction (Field Study At Tishreen University)”. Latakia University Journal - Economic and Legal Sciences Series 43, no. 2 (May 9, 2021). Accessed July 30, 2025. https://journal.latakia-univ.edu.sy/index.php/econlaw/article/view/10522.