Rampengan, Royke M. 2013. “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 (3):118-24. https://doi.org/10.35800/jip.1.3.2013.2569.