Boukhary, M.; Hussein, A. I. M.; Kamal, D. (2003). Nummulites issawii n. sp., a new species of the N. laevigatus Group from the Bartonian (Middle Eocene) of the southern Fayum area, Egypt. Neues Jahrbuch für Geologie, Paläontologie, Monatshefte. 351-362.
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Boukhary, M.; Hussein, A. I. M.; Kamal, D.
2003
Nummulites issawii n. sp., a new species of the N. laevigatus Group from the Bartonian (Middle Eocene) of the southern Fayum area, Egypt.