Glaessner, M. F., Richard L. Hoffman, W. A. Newman, Gerhard Hahn, V. A. Zullo, and W. D. Ian Rolfe. “Part R, Arthropoda 4, Vol. 1 & 2, Ch. 5, P. 567-629”. Treatise on Invertebrate Paleontology (January 1, 1969). Accessed November 24, 2024. https://journals.ku.edu/InvertebratePaleo/article/view/5630.