Simamora , . H. . ., Nuraeni , B. E. . . dan Junianto , P. . . (2025) “ 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(2), hlm. 215–226. doi: 10.62820/trt.v8i2.181.