Hasan, G., Andrew, A., Agustin, C., Seren , S., & Enjelia, Y. (2023). Membangun CRM (Customer Relationship Management) Pada Usaha UMKM Bola Ubi di Kota Batam. ECo-Buss, 6(1), 217–228. https://doi.org/10.32877/eb.v6i1.734