A. Siswanto and A. C. Hidayat, “Analisys of The Quality of Customer Service Satisfactory of Baitul Maal Wattamwil (BMT) Tamzis at Daerah Istimewa Yogyakarta and Jawa Tengah”, inobis, vol. 2, no. 2, pp. 152 - 167, Mar. 2019.