Mcadams, N. E. B., and J. M. Adrain. “Systematics of the Lower Ordovician Pliomerid Trilobite Hintzeia, With Species from the Great Basin, Western USA”. Zootaxa, vol. 2910, no. 1, June 2011, pp. 1–45, doi:10.11646/zootaxa.2910.1.1.