Van Der Made, H.N.; Van Staden, J.J.; Du Toit, J. de V.; Jordaan, E.; Barrett, E.L.; Coetzee, J.D.(Published by the Government Printer, Pretoria., 1980)
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)