Tambunan, Beryanto, and Laura Juita Pinem. 2020. “The Effect of Product Attributes on Purchasing Decision for Palm Oil Derivatives (Case Study: Chocolate Appolo at Bina Swalayan Medan)”. Jurnal Online Pertanian Tropik 7 (2):219-26. https://doi.org/10.32734/jopt.v7i2.4663.