Odendaal, M.W.; De Cramer, Kurt Guido Mireille; Van der Walt, Martha L.; Botha, A.D.; Pieterson, P.M.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
Wilkins, A.L.; Miles, Christopher O.; De Kock, W.T.; Erasmus, G.L.; Basson, A.T.; Kellerman, T. Stephanus(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1996)
Boomker, Jacob Diederik Frederik; Imes, G.D.; Cameron, Colin McKenzie; Naude, T.W.; Schoonbee, H.J.(Published by The Government Printer, Pretoria, 1979)
Mukaratirwa, S.; Nkulungo, E.; Matenga, E.; Bhebhe, E.(Published jointly by the Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the Faculty of Veterinary Science, University of Pretoria., 2003)