The Influence of Attitude, Subjective Norms, Perceived Behavioral Control, Environmental Concern and Environmental Awareness on the Purchase Intention of Palm Cooking Oil in Medan City. WSA [Internet]. 2025 Feb. 3 [cited 2025 Dec. 8];3(01):1-13. Available from: https://wsj.westsciences.com/index.php/wsa/article/view/1541