World Register of Marine Species (WoRMS)
Hayward, B.W.; Le Coze, F.; Vachard, D.; Gross, O. (2026). World Foraminifera Database. Sigmomorphina Cushman & Ozawa, 1928. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=415980 on 2026-08-29
Cushman, J. A.; Ozawa, Y. (1928). An outline of a revision of the Polymorphinidae. Contributions from the Cushman laboratory for foraminiferal research. 4(1): 13-21.
Makiyama, J.; Nakagawa, T. (1941). Pleistocene Foraminifera from Sima, Mie Prefecture. The Journal of the Geological Society of Japan. 48(572): 239-243.
Rouvillois, A. (1960). Le Thanétien du Bassin de Paris (étude hydrogéologique et micropaléontologique). Mémoires du Muséum national d'Histoire naturelle, Sér. C – Sciences de la Terre. 8: 1-151.