2 literature references for Gordionus violaceus (Baird, 1853):

Author: Poinar, George, Jr., and Clay M. Chandler
Year: 2004
Title: Synopsis and identification of North American hairworms (Gordioidea: Nematomorpha)
Source: Journal of the Tennessee Academy of Science, vol. 79, no. 1
Author: Schmidt-Rhaesa, Andreas, Ben Hanelt, and Will K. Reeves
Year: 2003
Title: Redescription and compilation of Nearctic freshwater Nematomprpha (Gordiida), with the description of two new species
Source: Proceedings of the Academy of Natural Sciences of Philadelphia, vol. 153