Sutrisno. “Pengaruh Service Quality, Digital Marketing Dan Customer Retention Terhadap Loyalitas Muzakki Lembaga Zakat (Studi Kasus Pada Lazismu DIY)”. CENDEKIA : Jurnal Penelitian Dan Pengkajian Ilmiah, vol. 1, no. 5, May 2024, pp. 209-20, https://doi.org/10.62335/r391vd15.