Rafiana A. S., Andi Besse, M. Ikhwan Maulana, Anwar, Burhanuddin, and Nurman. “OPTIMAL PORTFOLIO FORMATION ANALYSIS USING THE SINGLE INDEX MODEL DURING THE COVID-19 PANDEMIC: A Study on The LQ 45 Index on the Indonesian Stock Exchange (IDX)”. JOURNAL OF HUMANITIES, SOCIAL SCIENCES AND BUSINESS 2, no. 3 (June 15, 2023): 468–481. Accessed March 7, 2026. https://ojs.transpublika.com/index.php/JHSSB/article/view/625.