Susanto, Steven Pratama, and Melkyory Andronicus. “The Influence of Service Quality, Product Quality, and Promotion on Purchase Decision at PT. Unikitz Bersatu Group Medan Branch”. Jurnal Mantik 5, no. 2 (July 10, 2021): 946-952. Accessed October 26, 2026. https://www.ejournal.iocscience.org/index.php/mantik/article/view/1424.