Magano, David Kebalepile; Terblanche, S.E. (Stephanus Esaias), 1940-(South African Society for Agricultural Extension, Department of Agriculture, Economics, Extension and Rural Development, University of Pretoria, 2013)
Gemo, Helder R.; Stevens, Joseph Benjamin; Chilonda, P.(South African Society for Agricultural Extension, Department of Agriculture, Ecomomics, Extensions and Rural Development, University of Pretoria, 2013)
Pienaar, Juanita (Juanita Magrietha), 1965-; Du Plessis, Willemien (Wilhelmina), 1958-; Olivier, N.J.J. (Nicolaas Johannes Jacobus)(The Verloren van Themaat Centre for Public Law Studies, UNISA, 2013)