^On Classification of Pridoli (Silurian)-Lochkovian (Devonian) Spathognathodontidae (Conodonts). Murphy M.A., Valenzuela-Ríos J.I. and Carls P., 2004, University of California, Riverside Campus Museum Contribution, 6, pp. 1-25, 3 Figs. PDF
^Statistical study of Ozarkodina excavata (Branson and Mehl) and O. tuma Murphy and Matti (Lower Devonian, delta Zone, conodonts, Nevada). Michael A. Murphy and M. Kemal Cebecioglu, Journal of Paleontology, Volume 60, Issue 04, July 1986, pages 865-869, doi:10.1017/S0022336000043006