Rampengan, Royke M. “Amplitude of the Tidal Harmonic Constituents M2, S2, K1, and O1 in Waters Around the City of Bitung in North Sulawesi”. Jurnal Ilmiah PLATAX 1, no. 3 (August 21, 2013): 118–124. Accessed May 3, 2024. https://ejournal.unsrat.ac.id/v3/index.php/platax/article/view/2569.