JOSEPH, P.V., and CLARAMMA JACOB. “Bacterial, Fungal and Algal Population of Pennar River: A Fresh Water Wetland in Kottayam District, Kerala”. Asian Journal of Chemistry, vol. 22, no. 6, May 2010, pp. 4286-90, https://asianpubs.org/index.php/ajchem/article/view/16738.