Gopal, K., H. O. Verma, and S. Tripathi. “Water Quality Monitoring of Sur Sarovar (Keetham) Lake, Agra (Uttar Pradesh)”. Journal of Ecophysiology and Occupational Health, vol. 15, no. 3-4, May 2017, pp. 95-103, doi:10.18311/jeoh/2015/14498.