Safuan, Budiandru, Rudi Kurniawan Arief, Erry Yulian T. Adesta. “Web Based E-Catalog Implementation at TPK-KOJA: Case Study of Stock Inventory Division ”. International Journal of Advanced Science and Technology, Vol. 29, no. 7, May 2020, pp. 481 -88, http://sersc.org/journals/index.php/IJAST/article/view/13247.