Huttenlocker, Adam K.; Pardo, Jason D.; Small, Bryan J.; Anderson, Jason S. (2013). «Cranial morphology of recumbirostrans (Lepospondyli) from the Permian of Kansas and Nebraska, and early morphological evolution inferred by micro-computed tomography». Journal of Vertebrate Paleontology33 (3): 540-552. ISSN0272-4634. doi:10.1080/02724634.2013.728998.
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Huttenlocker, Adam K.; Pardo, Jason D.; Small, Bryan J.; Anderson, Jason S. (2013). «Cranial morphology of recumbirostrans (Lepospondyli) from the Permian of Kansas and Nebraska, and early morphological evolution inferred by micro-computed tomography». Journal of Vertebrate Paleontology33 (3): 540-552. ISSN0272-4634. doi:10.1080/02724634.2013.728998.