Srinivas Chippagiri. “A Holistic Review of PCI Security Standards Framework for Customer Relationship Management (CRM) Software”. International Journal of Intelligent Systems and Applications in Engineering 12, no. 4 (June 12, 2024): 4862 –. Accessed September 11, 2025. https://ijisae.org/index.php/IJISAE/article/view/7226.