Thezha El Hutapea, Suparman Suparman, and Meriah Kita Deliani N, “Procedure for Extending Safety Certificates for Coal Carrier Vessels at The Harbor Master’s Office and Class 1 Port Authority in PT. Pacific Samudra Sentosa Bandar Lampung”, Maeswara, vol. 2, no. 6, pp. 20–30, Dec. 2024.