1. Tjalsma RC, Lohmann GP. Paleocene-Eocene bathyal and abyssal benthic foraminifera from the Atlantic Ocean. Micropaleontology, Special Publication. 1983;4:1-90.
2. Bolli HM, Beckmann JP, Saunders JB. Benthic foraminiferal biostratigraphy of the south Caribbean region. Cambridge University; 1994. 1-408 p.
3. Nakkady SE. The stratigraphic implication of the accelerated tempo of evolution in the Mesozoic-Cenozoic transition of Egypt. Journal of Paleontology. 1955;29(4):702-706.
4. Nakkady SE. A new foraminiferal fauna from the Esna Shale and Upper Cretaceous chalk of Egypt. Journal of Paleontology. 1950;24(6):675-692.
5. Plummer HJ. Foraminifera of the Midway Formation in Texas. Bulletin University of Texas. 1927;2644:3-206.