Whittington, H. B., W. T. Dean, J. H. Shergold, A. W. A. Rushton, P. A. Jell, L. N. Repina, W. T. Chang, A. R. Palmer, J. R. Laurie, and R. A. Fortey. “Part O, Arthropoda 1 (Revised), Vol. 1, Ch. 4, P. 331-404”. Treatise on Invertebrate Paleontology (January 1, 1997). Accessed November 23, 2024. https://journals.ku.edu/InvertebratePaleo/article/view/5614.