Halidu, A. et al. 2016. Distribution of Coral Reefs Stone at the Reef Flat of South Coast Putus-Putus Island East Ratatotok, Ratatotok District Southeast Minahasa Regency. Jurnal Ilmiah PLATAX. 4, 1 (Sep. 2016), 19–30. DOI:https://doi.org/10.35800/jip.4.1.2016.13229.