Nor Muhamad, N. H. “’UMRA DAN RUQBA: ANALISIS MENGENAI KESANNYA TERHADAP KONTRAK HIBAH DAN POTENSINYA SEBAGAI INSTRUMEN AGIHAN HARTA: ’Umra and Ruqba: An Analysis of Their Impact on The Hibah Contract and Their Potential As Instruments of Wealth Distribution”. Jurnal Syariah, vol. 20, no. 1, Sept. 2015, pp. 1-46, http://jummec.um.edu.my/index.php/JS/article/view/22626.