Mulyani, Neni, Safrian Aswati, and Wan Mariatul Kifti. “SOFTWARE TESTING USING BLACK BOX TESTING BOUNDARY VALUE ANALYSIS (CASE STUDY: E-COMMERCE ON BOOKSTORE WALI SONGO MEDAN)”. GPH-International Journal of Computer Science and Engineering 1, no. 1 (August 30, 2018): 01-07. Accessed September 29, 2025. https://www.gphjournal.org/index.php/cse/article/view/21.