^Conodonts from the Chappel limestone of Texas. WH Hass, 1959
^A 17-element conodont apparatus from the Soom Shale Lagerstätte (Upper Ordovician), South Africa. Richard J. Aldridge, Duncan J. E. Murdock, Sarah E. Gabbott and Johannes N. Theron (2013), Palaeontology, 56 (2), pages 261–276, doi:10.1111/j.1475-4983.2012.01194.x