Kumaran, K.P. Navaneetha, J.J. Edet, and E.E. Nyong. “A Reappraisal of Salviniaceous Fossils and Its Implication on the Age and Depositional Environment of Nkporo Shale of Calabar Flank, Nigeria”. Journal of Palaeosciences 42, no. 1-3 (December 31, 1993): 210–214. Accessed May 7, 2024. https://jpsonline.co.in/index.php/jop/article/view/1148.