Goldberg, S.R.; Bursey, C.R.(Published jointly by the Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the Faculty of Veterinary Science, University of Pretoria., 2001)
Waruiru, R.M.; Weda, E.H.; Otieno, R.O.; Ngotho, J.W.(Published jointly by the Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the Faculty of Veterinary Science, University of Pretoria., 2002)