Yadav, K. K., N. Gupta, V. Kumar, S. Arya, and D. Singh. “Physico-Chemical Analysis of Selected Ground Water Samples of Agra City, India”. Recent Research in Science and Technology, vol. 4, no. 11, Feb. 2013, https://updatepublishing.com/journal/index.php/rrst/article/view/989.