Adenan, Adenan. “Study Of Flight Operations Safety Area (KKOP) At Yogyakarta International Airport – Kulonprogo”. Jurnal Manajemen Bisnis Transportasi dan Logistik 10, no. 2 (April 8, 2025): 107–124. Accessed August 9, 2026. https://journal.itltrisakti.ac.id/index.php/jmbtl/article/view/1898.