Rampengan, R. 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
, vol. 1, no. 3, Aug. 2013, pp. 118-24, doi:10.35800/jip.1.3.2013.2569.