Hutagalung, M. W. R., A. Soemitra, A. Rasyid, F. Y. Lubis, and I. Nura. “Prime Savings With Prizes in an Islamic Perspective”. Islamic Banking : Jurnal Pemikiran Dan Pengembangan Perbankan Syariah, vol. 7, no. 1, Aug. 2021, pp. 23-42, doi:10.36908/isbank.v7i1.305.