Rifa'i, Moh., et al. “A Marketable Leadership Strategy in Service Business; Case Study at KBIHU Nurul Haramain Kraksaan Probolinggo”. Tribakti: Jurnal Pemikiran Keislaman, vol. 32, no. 2, July 2021, pp. 247-62, https://doi.org/10.33367/tribakti.v32i2.1636.