Shields, Oakley. “Geologic Significance of Land Organisms That Crossed over the Eastern Tethys ‘Barrier’ During the Permo-Triassic”. Journal of Palaeosciences 43, no. 1-3 (December 31, 1994): 85–95. Accessed May 3, 2024. https://jpsonline.co.in/index.php/jop/article/view/1191.