World Register of Marine Species (WoRMS)
Nipperella keatingensis (Ross & Sabins, 1965)
Hayward, B.W.; Le Coze, F.; Vachard, D.; Gross, O. (2026). World Foraminifera Database. Nipperella keatingensis (Ross & Sabins, 1965)&nbsp;&#8224;. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1739159 on 2026-08-30
Ross, C. A.; Sabins, F. F. (1965). Early and Middle Pennsylvanian fusulinids from southeast Arizona. Journal of Paleontology. 39(2): 173-209.