Du Plessis, Willemien (Wilhelmina), 1958-; Pienaar, Juanita (Juanita Magrietha), 1965-; Olivier, N.J.J. (Nicolaas Johannes Jacobus)(The Verloren van Themaat Centre for Public Law Studies, UNISA, 2011)
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)
Du Plessis, Willemien (Wilhelmina), 1958-; Pienaar, Juanita (Juanita Magrietha), 1965-; Olivier, N.J.J. (Nicolaas Johannes Jacobus)(The Verloren van Themaat Centre for Public Law Studies, UNISA, 2013)
Stevens, Joseph Benjamin(South African Society for Agricultural Extension, Department of Agricultural Ecomomics, Extension and Rural Development, University of Pretoria, 2007)
Sebadieta, Rapelang Bamba; Terblanche, S.E. (Stephanus Esaias), 1940-; Ngomane, Tsakani(South African Society for Agricultural Extension, Department of Agricultural Ecomomics, Extension and Rural Development, University of Pretoria, 2007)
Borman, M.E.; Nealer, E.J.; Stevens, Joseph Benjamin(South African Society for Agricultural Extension, Department of Agriculture, Ecomomics, Extensions and Rural Development, University of Pretoria, 2009)
Masuku, Micah Bheki; Kirsten, Johann F.; Van Rooyen, C.J. (Cornelius Johannes); Perret, S. (Sylvain)(Agricultural Economics Association of South Africa, 2003-09)
Pienaar, Juanita (Juanita Magrietha), 1965-; Olivier, N.J.J. (Nicolaas Johannes Jacobus)(The Verloren van Themaat Centre for Public Law Studies, UNISA, 2009)