Purnama, Marselia, and Octavianti Purnama. “Stock Price and Covid-19 Vaccine: Comparison Study on PT. Kimia Farma, Tbk. (KAEF) Stock Prices”. Primanomics : Jurnal Ekonomi & Bisnis 20, no. 2 (May 9, 2022): 1–13. Accessed April 23, 2024. https://jurnal.buddhidharma.ac.id/index.php/PE/article/view/965.