Olivier, P.A.S.; Dippenaar, Susan M.; Khalil, L.F.; Mokgalong, N.M.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute ., 2000)
Dippenaar, Susan M.; Luus-Powell, Wilmien J.; Roux, F.(Published jointly by the Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the Faculty of Veterinary Science, University of Pretoria., 2001)