Simamora , Herto, Brigida Endah Nuraeni, dan Pilifus Junianto. “ The Influence Of Promotion, Product Variation And Service Quality On Purchasing Decisions At SRC Hutasoit Batu Aji Store, Batam City”. Tractare: Jurnal Ekonomi-Manajemen 8, no. 2 (Oktober 30, 2025): 215–226. diakses Januari 31, 2026. https://journal.stiebpbatam.ac.id/tractare/article/view/181.