Valliappan Raju, Assoc. Prof. Dr., and Prof Dr. Md Rom Bin Tamjis. “Role of Sustainability in Marketing Strategies: In the Context of Digital and Direct Marketing”. International Journal of Engineering & Technology 8, no. 1.10 (March 1, 2019): 5–9. Accessed May 4, 2024. https://sciencepubco.com/index.php/ijet/article/view/28012.