Coddington, Jonathan A., Larcher, S. F., and Cokendolpher, J. C. 1990. "The Systematic Status of Arachnida, Exclusive of Acari, in North America North of Mexico." In Systematics of the North American insects and arachnids: Status and needs. Kosztarab, M. and Schaefer, C. W., editors. 5–20. Blacksburg, VA: Virginia Polytechnic Institute and State University. 90 in Virginia Agricultural Experiment Station Information Series.