Deb, Nobonita, and Suchismita Das. “Impact of Fertilizer Urea on Liver Histopathology of Fresh Water Snake Head, Channa Punctata”. International Journal of Scientific Research in Biological Sciences, vol. 6, no. 1, Feb. 2019, pp. 216-9, https://ijsrbs.isroset.org/index.php/j/article/view/181.