Chodidjah, Suryani. “The Influence of Price Perception, Product Quality, and Promotion on Purchasing Decisions for Betawi Nasi Ulam”. Jurnal Mantik 10, no. 2 (August 30, 2026): 647-657. Accessed August 31, 2026. https://www.iocscience.org/ejournal/index.php/mantik/article/view/7412.