Siahaan, Gabriella Grace Yolanda, and Jhonny Siagian. “THE ANALYSIS OF OPTIMAL PORTFOLIO 3 COMPANIES’ STOCK AND THE INNOVATION OF STOCK PORTFOLIO, PERIOD OF 2014-2016”. Fundamental Management Journal 3, no. 1 (June 18, 2018): 25 - 31. Accessed December 4, 2024. http://ejournal.uki.ac.id/index.php/jm/article/view/718.