Abdul Razak, A.Q., Suyurno, S.S. and Nordin, R. 2020. The ‘Umrānic Thoughts of Ibn Khaldūn and Its Contributions to the Studies of Islamic Sociology and Civilization. Afkar: Jurnal Akidah & Pemikiran Islam. (Apr. 2020), 113–136. DOI:https://doi.org/10.22452/afkar.sp2020no1.5.