Darmawan, Didit, and Ayu Margareta. “Product Variety As a Basis for Differentiation and Its Managerial Implications in Wholesalin”. EKOMA : Jurnal Ekonomi, Manajemen, Akuntansi 5, no. 4 (April 17, 2026): 4129–4146. Accessed August 13, 2026. https://al-haramjournal.co.id/EKOMA/article/view/16114.