“PENGARUH SISTEM PELAYANAN JASA PEMASANGAN GLOBAL MARITIME DISTRESS & SAFETY SYSTEM TERHADAP KEPUASAN PELANGGAN”. Jurnal Pilar Nusa Mandiri, vol. 13, no. 2, Sept. 2017, pp. 223-6, https://ejournal.nusamandiri.ac.id/index.php/pilar/article/view/241.