Botha, C.J. (Christoffel Jacobus); Schultz, R.A. (Rowena Anitra); Van der Lugt, Jaco J.; Retief, E.; Labuschagne, Leonie(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)
Trichard, C.J.V.; Jordaan, P.; Jacobsz, Elsie P.; Henton, Marijke M.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1993)
Simbi, B.H.; Peter, T.F.; Burridge, M.J.; Mahan, S.M.(Pretoria : Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the University of Pretoria, Faculty of Veterinary Science, 2003)