Saragih, Jopinus, Zhenyu Cui, Diana Florenta Butar-Butar, and Hadi Panjaitan. “GENERATOR SET MAINTENANCE ANALYSIS IN SIMALUNGUN CITY HOTEL”. International Conference on Health Science, Green Economics, Educational Review and Technology 4, no. 1 (December 31, 2022): 69–80. Accessed January 7, 2025. http://proceeding.unefaconference.org/index.php/IHERT/article/view/134.