Maemunah, S. et al. 2025. Human Resources Certification and Ship Safety Competency in Lake Toba. Jurnal Manajemen Transportasi & Logistik (JMTRANSLOG). 12, 2 (Jul. 2025), 215–222. DOI:https://doi.org/10.54324/j.mtl.v12i2.1530.