Maddin, Hillary C.; Evans, David C.; Reisz, Robert R. (2006-12-11). "An Early Permian varanodontine varanopid (Synapsida: Eupelycosauria) from the Richards Spur locality, Oklahoma". Journal of Vertebrate Paleontology. 26 (4): 957–966. doi:10.1671/0272-4634(2006)26[957:aepvvs]2.0.co;2. ISSN0272-4634.
Reisz, Robert R.; Modesto, Sean P. (September 2007). "Heleosaurus scholtzifrom the Permian of South Africa: A varanopid synapsid, not a diapsid reptile". Journal of Vertebrate Paleontology. 27 (3): 734–739. doi:10.1671/0272-4634(2007)27[734:HSFTPO]2.0.CO;2. ISSN0272-4634.
Campione, Nicolás E.; Reisz, Robert R. (2010-05-18). "Varanops brevirostris(Eupelycosauria: Varanopidae) from the Lower Permian of Texas, with discussion of varanopid morphology and interrelationships". Journal of Vertebrate Paleontology. 30 (3): 724–746. doi:10.1080/02724631003762914. ISSN0272-4634. S2CID84949154.
Benson, R.J. (2012). "Interrelationships of basal synapsids: cranial and postcranial morphological partitions suggest different topologies". Journal of Systematic Palaeontology. 10 (4): 601–624. doi:10.1080/14772019.2011.631042. S2CID84706899.
Kissel, Richard; Shinya, Akiko (12 September 2003). "The Astragalus-Calcaneum Complex of Mycterosaurus and Varanops (Synapsida: Varanopidae): Morphology, Locomotion, and Phylogeny". Journal of Vertebrate Paleontology. 23 (3 Suppl): 96A–97A. JSTOR4524374.
Campione, Nicolás E.; Reisz, Robert R. (2010-05-18). "Varanops brevirostris(Eupelycosauria: Varanopidae) from the Lower Permian of Texas, with discussion of varanopid morphology and interrelationships". Journal of Vertebrate Paleontology. 30 (3): 724–746. doi:10.1080/02724631003762914. ISSN0272-4634. S2CID84949154.
Benson, R.J. (2012). "Interrelationships of basal synapsids: cranial and postcranial morphological partitions suggest different topologies". Journal of Systematic Palaeontology. 10 (4): 601–624. doi:10.1080/14772019.2011.631042. S2CID84706899.
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Maddin, Hillary C.; Evans, David C.; Reisz, Robert R. (2006-12-11). "An Early Permian varanodontine varanopid (Synapsida: Eupelycosauria) from the Richards Spur locality, Oklahoma". Journal of Vertebrate Paleontology. 26 (4): 957–966. doi:10.1671/0272-4634(2006)26[957:aepvvs]2.0.co;2. ISSN0272-4634.
Reisz, Robert R.; Modesto, Sean P. (September 2007). "Heleosaurus scholtzifrom the Permian of South Africa: A varanopid synapsid, not a diapsid reptile". Journal of Vertebrate Paleontology. 27 (3): 734–739. doi:10.1671/0272-4634(2007)27[734:HSFTPO]2.0.CO;2. ISSN0272-4634.
Campione, Nicolás E.; Reisz, Robert R. (2010-05-18). "Varanops brevirostris(Eupelycosauria: Varanopidae) from the Lower Permian of Texas, with discussion of varanopid morphology and interrelationships". Journal of Vertebrate Paleontology. 30 (3): 724–746. doi:10.1080/02724631003762914. ISSN0272-4634. S2CID84949154.