Van Halderen, A.; Van Rensburg, W.J.J.; Geyer, A.; Vorster, J.H. (Jan Harm)(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
Miles, Christopher O.; Wilkins, A.L.; Erasmus, G.L.; Kellerman, T. Stephanus(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
Hunter, P.; Erasmus, B.J.; Vorster, J.H. (Jan Harm)(Published jointly by the Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the Faculty of Veterinary Science, University of Pretoria., 2002)
Elkan, P.W.(Published jointly by the Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the Faculty of Veterinary Science, University of Pretoria., 2001)