Grant, C.C. (Catharina Cornelia); Biggs, H.C.; Meissner, H.H.; Basson, P.A.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1996)
Basson, P.A.; Morgenthal, J.C.; Bilbrough, R.B.; Marais, Johannes Lodewyk; Kruger, S.P.; Van der Merwe, J.L.(Published by the Government Printer, Pretoria, 1969)