Nugroho Budi R. “MASALAH TRANSPORTASI MELALUI PENDEKATAN SISTEM”. Langit Biru: Jurnal Ilmiah Aviasi 1, no. 1 (May 30, 2008): 6-9. Accessed July 3, 2024. https://journal.ppicurug.ac.id/index.php/jurnal-ilmiah-aviasi/article/view/96.