Yunita, Rahma, Erzalina Ayu Satya Megananda, Idris Idris, and Fuad Mas’ud. “Markowitz and Single Index Models for Optimal Portfolio Formation: Evidence from the SRI-KEHATI Index”. Entrepreneurship and Innovation Review 4, no. 1 (June 8, 2026): 108–125. Accessed June 13, 2026. https://journal.lifescifi.com/index.php/eir/article/view/1402.