Mulyaningsih, May, Sri Hartini, Resta Anggraeni, and Denis Putra Mahendra. “Analysis of Covid-19 Impact on Stock’s Abnormal Return in Sub Cigarette Sector Companies Listed on BEI”. Journal of Social Transformation and Regional Development 3, no. 1 (June 28, 2021): 70–84. Accessed March 12, 2026. https://penerbit.uthm.edu.my/ojs/index.php/jstard/article/view/7604.