Baxter, R.W. “Problamatical Fossil of Psilophytalean Aspect from the Upper Pennsylvanian of Eastern Kansas”. Journal of Palaeosciences 21, no. (1-3) (December 31, 1972): 39–41. Accessed November 24, 2024. https://jpsonline.co.in/index.php/jop/article/view/1466.