Tamanampo, J. W. F. S., Kaligis, G. J. F. and Lumingas, lawrence J. L. (2017) “Cumulatif valuation of physic-chemical water quality from Tondano Lake, North Sulawesi”, Jurnal Ilmiah PLATAX, 5(2), pp. 135–144. doi: 10.35800/jip.5.2.2017.15533.