Syah, Rahmat, Eddy Marlianto, Mester Sitepu, and . Motlan. 2015. “Analysis of the Porites Coral Reef Growth Based on Natural Causes in Central Tapanuli Sub Region, North Sumatra Indonesia”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 22 (2):121-29. https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/3972.