M. R. Khamis and M. F. bin Kamarudin, “The Economic Theory Assumption and Utility Maximization Model: The Perspective of Zakat Compliance Behavior”, IMBR, vol. 15, no. 2(I)SI, pp. 17–34, Jun. 2023, doi: 10.22610/imbr.v15i2(I)SI.3415.