Ab. Aziz, M.R. et al. 2015. Investigating The Relationship Between Level of Income, Method of Contribution and Appointment of Islamic Waqf Bank as an Agent in Collecting Waqf Fund. Ulum Islamiyyah. 15, (Aug. 2015), 125–138. DOI:https://doi.org/10.33102/uij.vol15no.238.