https://web.archive.org/web/20101124110449/http://www.palaeos.com/Vertebrates/Units/400Therapsida/600.html Boonstra L.D., "The Fauna of the Tapincephalus Zone (Beaufort Beds of the Karoo)", Ann. S. Afr. Mus. 56 (1) 1-73, 1969, s. 35-38. Colbert E.H., Evolution of the Vertebrates, John Wiley & Sons Inc 1969 (wyd. 2). von Zittel K.A, Textbook of Paleontology, C.R. Eastman 1932 (wyd. 2), Macmillan & Co. tom.2, s.255
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