Putri, S. M. ., and P. . Sari. “Analysis of Related Rates of Increase in PT. Singa Asia Perkasa Utama”. Journal of Management Science (JMAS), vol. 7, no. 1, Jan. 2024, pp. 217-22, https://exsys.iocspublisher.org/index.php/JMAS/article/view/390.