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Cushman, J. A. (1931). The Foraminifera of the Atlantic Ocean pt. 8: Rotaliidae, Amphisteginidae, Calcarinidae, Cymbaloporettidae, Globorotaliidae, Anomalinidae, Planorbulinidae, Rupertiidae, and Homotremidae. Bulletin of the United States National Museum. (104): 1-179.
Cushman, J. A. (1931). The Foraminifera of the Atlantic Ocean pt. 8: Rotaliidae, Amphisteginidae, Calcarinidae, Cymbaloporettidae, Globorotaliidae, Anomalinidae, Planorbulinidae, Rupertiidae, and Homotremidae. Bulletin of the United States National Museum. (104): 1-179.