Pienaar, J. G.; Van der Westhuizen, G.C.A.; Anderson, L.A.P.; Naude, T.W.; Kellerman, T. Stephanus(Published by The Government Printer, Pretoria, 1976)
Kellerman, T. Stephanus; Van der Westhuizen, G.C.A.; Coetzer, Jacobus A.W.; Roux, Cecilia; Marasas, Walter F.O. (Walter Friedrich Otto); Minne, J.A.; Basson, P.A.(Pretoria : The Government Printer, 1980)