Nugroho Budi R. “MASALAH TRANSPORTASI MELALUI PENDEKATAN SISTEM”. Langit Biru: Jurnal Ilmiah Aviasi 1, no. 1 (May 30, 2008): 6–9. Accessed May 14, 2026. https://jurnal.overthinkingku.com/index.php/jurnal-ilmiah-aviasi/article/view/96.