Venkatachala, B.S. “Gerhard, O.W. Kremp, 1965. Morphologic Encyclopedia of Palynology”. Journal of Palaeosciences 16, no. (1-3) (December 31, 1967): 101. Accessed July 18, 2024. https://jpsonline.co.in/index.php/jop/article/view/507.