Singh, R., and A. K. Dwivedi. “Study of History and Paleoclimatic Situation of Fossil Development in Salkhan, Sonbhadra, India”. Central Asian Journal of Theoretical and Applied Science, Vol. 4, no. 6, June 2023, pp. 119-25, https://www.cajotas.casjournal.org/index.php/CAJOTAS/article/view/1214.