“Analysis of Productivity Synchronization of Barge Transportation Equipment and Crane Loading on Nickel Ore Delivery Activities in PT. Antam Nickel UBP North Maluku: Analisis Sinkronisasi Produktivitas Alat Angkut Tongkang dan Alat Muat Crane pada Kegiatan Pengapalan Nickel Ore di PT. Antam UBP Nikel Maluku Utara”. JURNAL GEOCELEBES 6, no. 2 (Oktober 31, 2022): 179 – 186. Diakses Agustus 21, 2026. https://journal-598.unhas.ac.id/index.php/geocelebes/article/view/22043.