Bharadwaj, D.C., and S.K. Salujha. “Sporological Study of Seam VIII in Raniganj Coalfield, Bihar (India): Part 1. Description of Sporae Dispersae”. Journal of Palaeosciences 12, no. (1-3) (December 31, 1963): 181–215. Accessed July 23, 2024. https://jpsonline.co.in/index.php/jop/article/view/653.