Sihombing, Kelvin, R Hamdani Harahap, and Miswar Budi Mulya. 2023. “ANALYSIS OF COASTAL WATER QUALITY AT MARINE TOURISM SITES IN THE CITY OF SIBOLGA”. Asian Journal of Aquatic Sciences 6 (3), 447-55. https://doi.org/10.31258/ajoas.6.3.447-455.