magdalena, B. ., Rafiq, M. . and Widjayanti , Y. B. . (2025) “Optimizing Digital Marketing of Gunung Madu Service Cooperative Using Whatsapp Business”, Jurnal Pengabdian Masyarakat Tapis Berseri (JPMTB), 4(1), pp. 57–64. doi: 10.36448/jpmtb.v4i1.133.