Hilman, Muhammad Irfan, and Deddy Priatmodjo Koesrindartoto. “Revisit the Use of Index Returns As the Proxy of Market Return in CAPM”. Eqien - Jurnal Ekonomi dan Bisnis 12, no. 03 (September 5, 2023): 315–327. Accessed August 29, 2025. http://stiemuttaqien.ac.id/ojs/index.php/OJS/article/view/1492.