Sidor & Rubidge 2006. Herpetoskylax hopsoni, a new Biarmosuchian (Therapsida: Biarmosuchia) from the Beaufort Group of South Africa. Carrano, Matthew T.; Gaudin, Timothy J.; Blob, Richard W.; Wible, John R.[Eds]. Amniote paleobiology: perspectives on the evolution of mammals, birds, and reptiles: a volume honoring James Allen Hopson., University of Chicago Press, Chicago & London, 2006: i-vi, 1-547. Chapter pagination: 76-113