Tamanampo, Jan W. F. S., Georis J. F. Kaligis, and lawrence J. L. Lumingas. 2017. “Cumulatif Valuation of Physic-Chemical Water Quality from Tondano Lake, North Sulawesi”. Jurnal Ilmiah Platax 5 (2):135-44. https://doi.org/10.35800/jip.5.2.2017.15533.