Abdul Ghani Azmi, I., and N. Hamzah. “Human Resource Management Practices in the Era Of Khulafā’ Aal-Rāshidīn (11-40 AH / 632-661 AD)”. Jurnal Usuluddin, vol. 42, Dec. 2015, pp. 147-74, doi:10.22452/usuluddin.vol42no1.7.