Jajan Badruzaman. “Analysis of Comparison of Stock Prices before and After Announcement of Business-27 INDKS (Census on Companies in the Category of Business Index 27 in 2018)”. Global Journal of Human-Social Science 19, no. E5 (March 15, 2019): 35–38. Accessed May 5, 2024. https://socialscienceresearch.org/index.php/GJHSS/article/view/2905.