Mahmudah, Syahriatul, Widi Lstiyas Rini, and Aditya Maulana Majid. “The Role of Portfolio Theory in Risk Management and Investment Decision Making”. Magister : Manajemen Strategis dan Terapan 1, no. 1 (May 25, 2024): 30–36. Accessed November 25, 2025. http://ejournal.itbwigalumajang.ac.id/index.php/mgt/article/view/1370.