Haidar, M. F., and T. Indriyanto. “Identification of Sustainability Course Topics Relevant to the Needs of Airport Professionals”. Langit Biru: Jurnal Ilmiah Aviasi, Vol. 18, no. 3, Oct. 2025, pp. 118 -29, doi:10.54147/langitbiru.v18i3.1291.