Surange, K.R., and Hari K. Maheshwari. “Studies in the Glossopteris Flora of India - 11. Some Observations on Vertebraria from the Lower Gondwana of India”. Journal of Palaeosciences 9, no. (1-2) (December 31, 1960): 61–67. Accessed November 25, 2024. https://jpsonline.co.in/index.php/jop/article/view/599.