Hessler, Robert H., Raymond C. Moore, Paul Tasch, and A. R. Palmer. “Part R, Arthropoda 4, Vol. 1 & 2, Ch. 2, P. 120-206”. Treatise on Invertebrate Paleontology (January 1, 1969). Accessed May 5, 2024. https://journals.ku.edu/InvertebratePaleo/article/view/5627.