A. Shaji George, and S. Sagayarajan. “Securing Cloud Application Infrastructure: Understanding the Penetration Testing Challenges of IaaS, PaaS, and SaaS Environments”. Partners Universal International Research Journal 2, no. 1 (March 31, 2023): 24–34. Accessed October 8, 2025. https://www.puirj.com/index.php/research/article/view/84.