D'Haese, M.F.C. (Marijke); Calus, M.; Kirsten, Johann F.; Van Huylenbroeck, Guido; Bostyn, F.(Agricultural Economics Association of South Africa, 2001-12)
Sartorius, Kurt; Kirsten, Johann F.(Independent Regulatory Board for Auditors (IRBA), SA Institute of Chartered Accountants (SAICA) & SA Association of Accountants (SAAA), 2004-06)
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, 2008)
Terblanche, S.E. (Stephanus Esaias), 1940-(South African Society for Agricultural Extension, Department of Agricultural Ecomomics, Extension and Rural Development, University of Pretoria, 2007)
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, 2012)
Duvel, G.H. (Gustav Heinrich)(South African Society for Agricultural Extension, Department of Agriculture, Ecomomics, Extensions and Rural Development, University of Pretoria, 2008)
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, 2009)
Doyer, O.T.; D'Haese, M.F.C. (Marijke); Kirsten, Johann F.; Van Rooyen, C.J. (Cornelius Johannes)(Agricultural Economics Association of South Africa, 2007-12)