Sunandar, Ali, Saipol Bari Abd Karim, and Umi Kalsum Zolkafli @Zulkifly. “Exploring Delphi Method Utilization Research Trends on Public-Private Partnership Infrastructure Studies”. Journal of Infrastructure Policy and Management (JIPM) 8, no. 1 (June 23, 2025): 21–40. Accessed June 26, 2025. https://jipm.iigf.co.id/index.php/jipm/article/view/92.