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)