Van Sonsbeek, Gerda R.; Van der Kolk, Johannes H.; Van Leeuwen, Johannes P.T.M.; Everts, Hendrik; Marais, Johan; Schaftenaar, Willem(American Association of Zoo Veterinarians, 2013-09)
Benedictus, Lindert; Otten, Henny G.; Van Schaik, Gerdien; Van Ginkel, Walter G .J.; Heuven, Henri C.M.; Nielen, Mirjam; Rutten, Victor P.M.G.; Koets, Ad P.(BioMed Central, 2014-12)
University of Pretoria. Faculty of Veterinary Science. Dept. of Veterinary Anatomy and Physiology; Smuts, M.M.S. (Malie Marie Sophie), 1933-(Pretoria : University of Pretoria, Faculty of Veterinary Science. Dept. of Veterinary Anatomy and Physiology, 1991)
Horak, Ivan Gerard; Nyangiwe, Nkululeko; De Matos, Carlos Antonio; Neves, L.C.B.G.D. (Luís)(Agricultural Research Council, ARC-OVI and the University of Pretoria, 2009-02)