HAMUDIN, P.; YUNITA, I. Optimization of Stock Portfolio Investment on the IDXHIDIV20 Index Using the Single Index Model and Markowitz Model Approach for Beginner Investors. INTERNATIONAL JOURNAL OF ECONOMICS AND MANAGEMENT REVIEW, [S. l.], v. 3, n. 3, p. 19–33, 2025. DOI: 10.58765/ijemr.v3i3.283. Disponível em: https://jurnal.smartindo.org/index.php/ijemr/article/view/283. Acesso em: 22 may. 2026.