M Nastain, Irwan Abdullah, Zuly Qodir, and Hasse Jubba. “Infrastructure Barriers to Islamic Political Parties: Dynamics of PKB in the 2004-2019 Presidential Election Contestation”. International Journal of Social Science and Religion (IJSSR) 5, no. 1 (February 12, 2024): 103–122. Accessed January 31, 2026. http://ijssr.net/index.php/ijssr/article/view/224.