Maemunah, Siti, Adnan Bayu Aji, Edhie Budi Setiawan, Yuliantini Yuliantini, and Yana Tatiana. 2025. “Human Resources Certification and Ship Safety Competency in Lake Toba”. Jurnal Manajemen Transportasi & Logistik (JMTRANSLOG) 12 (2):215-22. https://doi.org/10.54324/j.mtl.v12i2.1530.