Syafiudin, Arsya Nadira, et al. “Customer’s Loyalty Parameters of Sikorsky S76 Chartered Helicopter”. Jurnal Manajemen Transportasi & Logistik (JMTRANSLOG), vol. 10, no. 1, Apr. 2023, pp. 19-28, doi:10.54324/j.mtl.v10i1.1067.