Harahap, Vica, et al. “SALES CONTRIBUTION THROUGH MOBILE APPLICATION IN CGK-SIN ROUTE AT SINGAPORE AIRLINES LTD JAKARTA”. Jurnal Manajemen Bisnis Transportasi Dan Logistik, vol. 5, no. 1, Sept. 2018, pp. 1-10, doi:10.54324/j.mbtl.v5i1.887.