IRWANA, E. .; GINTING, D. .; GINTING, S. .; TARUNA, T. PERPANJANGAN SERTIFIKAT CONSTRUCTION, SERTIFIKAT EQUIPMENT, DAN RADIO KAPAL TB. MEDELIN SIGNAL DI KANTOR KESYAHBANDARAN UTAMA BELAWAN PADA PT.MULTI JAYA SAMUDRA BELAWAN. Jurnal Adiguna Maritim Indonesia, [S. l.], v. 2, n. 2, p. 55-58, 2025. DOI: 10.54196/jami.v2i2.237. Disponível em: https://ejournal-poltekamimedan.my.id/index.php/jami/article/view/237. Acesso em: 27 jul. 2026.