N. Sitthiwong, A. Uedpha, M. Jaisuk, S. Dawaset, and W. Namakote, “Phytoplanktons and Water Quality in Nong Yasai and Nong Hai Reservoirs, Sakon Nakhon Rajabhat University, Sakon Nakhon Province”, Prog Appl Sci Tech., vol. 5, no. 2, pp. 22–34, Dec. 2015.