Axelrod, Daniel I. “23rd Sir Albert Charles Seward Memorial Lecture: Analysis of Some Palaeogeographic and Palaeobotany”. Journal of Palaeosciences 35, no. (1-3) (December 31, 1986): 115–129. Accessed May 15, 2024. https://www.jpsonline.co.in/index.php/jop/article/view/1516.