Miftach, Z., and P. Pasek. “Analysis of Port Costs and Loading and Unloading Costs on Income PT. Abdi Nusantara Indonesia Line Branch of Gresik”. JURNAL APLIKASI PELAYARAN DAN KEPELABUHANAN, vol. 9, no. 1, Sept. 2018, pp. 53-62, doi:10.30649/japk.v9i1.42.