Sidney H. Haughton, Lieuwe D. Boonstra: Pareiasaurian Studies. Part I. – An Attempt at a Classification of the Pareiasauria based on Skull Features. In: Annals of the South African Museum. Bd. 28, Nr. 1, 1929, ISSN0303-2515, S. 79–87, Digitalisat.
Sidney H. Haughton, Lieuwe D. Boonstra: Pareiasaurian Studies. Part I. – An Attempt at a Classification of the Pareiasauria based on Skull Features. In: Annals of the South African Museum. Bd. 28, Nr. 1, 1929, ISSN0303-2515, S. 79–87, Digitalisat.