OPTIMIZATION OF WATCHKEEPING DUTIES DURING CARGO LOADING AND UNLOADING OPERATIONS ON BOARD MV. TANTO EXPRESS. JuMMa [Internet]. 2026 Jul. 1 [cited 2026 Nov. 3];7(2, Juli):513-22. Available from: https://journal.poltekpelaceh.ac.id/index.php/jumama/article/view/190