Syamsyir, Syamsyir, Soleh Uddin, Nelfi Erlinda, and Basrizal Basrizal. 2025. “Development of a Diesel Engine Maintenance Textbook for Nautical Technology Students at West Sumatra Shipping Polytechnic”. Global Education Journal 3 (2):943-48. https://doi.org/10.59525/gej.v3i2.947.