Kuswardani, DC, and Raully Sijabat. “PEMASARAN RELASIONAL, FAKTOR KEBERHASILAN DALAM MEMPERTAHANKAN PELANGGAN”. Solusi 8, no. 1 (February 13, 2020). Accessed July 3, 2026. https://journals.usm.ac.id/index.php/solusi/article/view/1923.