Kwenani, K.M. (Kingsley Mabuku); Terblanche, S.E. (Stephanus Esaias), 1940-(South African Society for Agricultural Extension, Department of Agriculture, Ecomomics, Extensions and Rural Development, University of Pretoria, 2009)
Terblanche, S.E. (Stephanus Esaias), 1940-; Stevens, Joseph Benjamin; Sekgota, Mpolaeng Gilbert(South African Society for Agricultural Extension, Department of Agriculture, Economics, Extension and Rural Development, University of Pretoria, 2014)