Abdul Razak, A. Q., S. S. Suyurno, and R. Nordin. “The ‘Umrānic Thoughts of Ibn Khaldūn and Its Contributions to the Studies of Islamic Sociology and Civilization”. Afkar: Jurnal Akidah &Amp; Pemikiran Islam, Apr. 2020, pp. 113-36, doi:10.22452/afkar.sp2020no1.5.