Mahapatra, G., et al. “Residual Level of Chromium, Copper and Manganese in Soil and Water of N-24 Parganas (West Bengal) and Its Relation to Chevon Quality”. International Journal of Bio-Resource and Stress Management, vol. 10, no. Apr, 2, Apr. 2019, pp. 141-5, https://www.ojs.pphouse.org/index.php/IJBSM/article/view/3806.