Kumaran, K.P. Navaneetha, and J.J. Edet. “Palynostratigraphy of the Late Cretaceous Nkporo Shale Outcrop in the Anambra Basin, Nigeria”. Journal of Palaeosciences 42, no. 1-3 (December 31, 1993): 372–379. Accessed May 6, 2024. https://www.jpsonline.co.in/index.php/jop/article/view/1156.