Loeblich, Alfred R., R. C. Douglass, W. Storrs Cole, Helen Tappan, and Manfred Reichel. “Part C, Protista 2, Vol. 1 & 2, v.2, Ch.5, P. 511-604”. Treatise on Invertebrate Paleontology (January 1, 1964). Accessed November 23, 2024. https://journals.ku.edu/InvertebratePaleo/article/view/5094.