Hulu, Y. E., I. Harefa, Y. Mendrofa, and T. H. S. Hulu. “Pengaruh Costumer Relationship Management Terhadap Keputusan Pembelian Ulang Pada CV Werry Bakery Gunungsitoli”. ProBisnis : Jurnal Manajemen, vol. 17, no. 5, Oct. 2026, pp. 3057-6, https://ejournal.joninstitute.org/index.php/ProBisnis/article/view/1721.