Pangaribuan, Jonner. “ANALISIS EFISIENSI PENENTUAN PORTOFOLIO SAHAM PERUSAHAAN MANUFAKTUR DI PT. BURSA EFEK INDONESIA (BEI)”. Jurnal Manajemen dan Bisnis 12, no. 2 (December 13, 2017): 38–56. Accessed November 22, 2024. https://ejournal.ust.ac.id/index.php/JIMB_ekonomi/article/view/58.