SUTARYANTO. AN EASY WAY OF ASKING QUESTIONS . Langit Biru: Jurnal Ilmiah Aviasi, indonesia, v. 2, n. 3, p. 41–48, 2009. DOI: 10.54147/langitbiru.v2i3.275. Disponível em: https://jurnal.overthinkingku.com/index.php/jurnal-ilmiah-aviasi/article/view/275. Acesso em: 14 may. 2026.