Roni Rahmad Hasonangan Ritonga, and Zulkarnaen. “Study of the Implementation of Islamic Leadership (Imamah, Caliph, and Ulil Amri) in Indonesia”. al-Afkar, Journal For Islamic Studies 8, no. 2 (June 29, 2025): 2208–2225. Accessed August 27, 2026. https://mail.al-afkar.com/index.php/Afkar_Journal/article/view/2348.