Ridlwan, A. A., and R. Sukmana. “The Determinant Factors of Motivation to Pay Zakat in Regional Amil Zakat Agency of East Java”. KARSA: Jurnal Sosial Dan Budaya Keislaman (Journal of Social and Islamic Culture) , Vol. 25, no. 2, Jan. 2018, pp. 334-45, doi:10.19105/karsa.v25i2.1398.