Athief, Fauzul Hanif Noor, Darlin Rizki, Ulin Nuha, and Adityo Wiwit Kurniawan. “The Service Strategy Used by Yayasan Kemanusiaan Kotak Amal Indonesia in Maintaining Donor Loyalty”. Insight Management Journal 3, no. 1 (September 30, 2022): 31-39. Accessed November 1, 2025. https://journals.insightpub.org/index.php/imj/article/view/217.