Ab Rahman, Muhamad Firdaus, et al. “Analisa Ketidakselarasan Taksiran Zakat Pertanian Di Malaysia: The Analysis of Non-Uniformity Estimation of Agricultural Zakah in Malaysia”. The Journal of Muamalat and Islamic Finance Research, vol. 11, no. 1, Jan. 2014, pp. 97-125, https://jmifr.usim.edu.my/index.php/jmifr/article/view/164.