Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Van Amstel, S.R.; Oberem, P.T.(Published by the Government Printer, Pretoria., 1987)
Kriek, N.P.J.; Keet, D.F.; Raath, J.P.; De Vos, Valerius; Huchzermeyer, Hildegard F.A.K.; Bengis, Roy G.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1996)