Tiwari, R.S. “Palynological Succession through Raniganj Formation (Upper Permian), Raniganj Coalfield, India”. Journal of Palaeosciences 23, no. 1-3 (December 31, 1974): 16–24. Accessed May 10, 2024. https://jpsonline.co.in/index.php/jop/article/view/945.