Ridho, Syarifur, Irfan Toro Manullang Saturut, Rio Maulana, and Dealis Waruru. “Certification of Human Resources, Skills, and Welfare As Performance Determinants in the Operational Area of PT. Patra Niaga DOK Dumai Terminal”. JURNAL APLIKASI PELAYARAN DAN KEPELABUHANAN 15, no. 2 (May 26, 2025): 313–326. Accessed December 20, 2025. https://pdp-journal.hangtuah.ac.id/index.php/jurnal/article/view/150.