Basson, P.A.; Miller, E.S.; Kellerman, T. Stephanus; Albl, P.; Von Maltitz, L.J.F.; Welman, Wilhelmina G.(Published by The Government Printer, Pretoria, 1975)
Grant, C.C. (Catharina Cornelia); Biggs, H.C.; Meissner, H.H.; Basson, P.A.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1996)