Original, D. ., G. M. . Oligario, J. . Suarez, A. . Duazo, G. . Canonigo, and P. C. . Moreno. “Marketing Management System”. Ascendens Asia Singapore – Bestlink College of the Philippines Journal of Multidisciplinary Research, vol. 2, no. 1, Apr. 2020, https://ojs.aaresearchindex.com/index.php/aasgbcpjmra/article/view/2400.