W. E. Frerichs, C. C. Atherton, P. N. Shive; Planktonic foraminifera from the chalky members of the Niobrara Formation, Centennial Valley, Wyoming. Journal of Foraminiferal Research ; 5 (4): 294–312. doi: https://doi.org/10.2113/gsjfr.5.4.294
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