Widoro, E., B. S. Arrafat, and A. Kurniawan. “Online Learning Class Setting of Recurrent Human Factor Training for Aircraft Maintenance Engineer License Holder”. Langit Biru: Jurnal Ilmiah Aviasi, Vol. 17, no. 3, Dec. 2024, pp. 116 -24, doi:10.54147/langitbiru.v17i3.1144.