Bachtiar, Tiar Anwar, and Nandang Nursaleh. 2021. “Indonesian Sultanates and Their Alleged Allegiance to Islamic Caliphates: A Historical Analysis of ‘Jejak Khilafah Di Nusantara’”. IIUM Journal of Religion and Civilisational Studies 4 (2):151-72. https://doi.org/10.31436/ijrcs.v4i2.206.