Rahmat, Ilham. “Influence of Price, Product Quality, Location and Promotion on Purchasing Decisions of Cinta Air Hitam Langkat Chips”. Digital Business: Tren Bisnis Masa Depan 14, no. 1 (March 1, 2023): 7–15. Accessed May 10, 2026. https://ejournal.cria.or.id/index.php/db/article/view/52.