Masuku, Micah Bheki; Kirsten, Johann F.; Van Rooyen, C.J. (Cornelius Johannes); Perret, S. (Sylvain)(Agricultural Economics Association of South Africa, 2003-09)
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)