Kakono, O.; Hove, T.; Mahan, S.; Geysen, Dirk(Pretoria : Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the University of Pretoria, Faculty of Veterinary Science, 2003)
Stylianides, E.; Zuckerman, E.E.; Hardy, W.D. Jr.; Kania, Stephen(Published jointly by the Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the Faculty of Veterinary Science, University of Pretoria., 2003)