Fourie, Niel; Kellerman, T. Stephanus; Cornelius, S.T.; Ward, Caroline; Van der Lugt, Jaco J.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
Botha, C.J. (Christoffel Jacobus); Van der Lugt, Jaco J.; Erasmus, G.L.; Kellerman, T. Stephanus; Schultz, R.A. (Rowena Anitra)(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1997)