Tiwari, R.S., S.C. Srivastava, Archana Tripathi, and Vijaya. “Morphographic Study of Permian Palynomorphs: Callumispora, Parasaccites, Crucisaccties and Faunipollenites”. Journal of Palaeosciences 37, no. (1-3) (December 31, 1988): 215–266. Accessed May 3, 2024. https://jpsonline.co.in/index.php/jop/article/view/1622.