Cockerell, T. D. A. (1889). Preliminary remarks on the molluscan fauna of Colorado. <em>Journal of Conchology.</em> 6(1): 60-65., available online athttp://biodiversitylibrary.org/page/31566826 page(s): 63 [details]
original descriptionCockerell, T. D. A. (1889). Preliminary remarks on the molluscan fauna of Colorado. <em>Journal of Conchology.</em> 6(1): 60-65., available online athttp://biodiversitylibrary.org/page/31566826 page(s): 63 [details]
basis of recordInvertEBase. (2018). Authority files of U.S. and Canadian land and freshwater mollusks developed for the InvertEBase (InvertEBase.org) project. [details]
additional sourceVanatta, E. G. & Pilsbry, H. A. (1906). <i>Bifidaria pentodon</i> and its allies. <em>The Nautilus.</em> 19(11): 121-128, pls. 6-7, figs. 1-53., available online athttps://www.biodiversitylibrary.org/page/1755696 page(s): 125 [details]