Kirsten, Johann F.; Vermeulen, Hester; Van Zyl, Karlien; Du Rand, Gerrie Elizabeth; Du Plessis, Henrietta Johanna; Weissnar, Tessa(CentMa Press, 2017-01)
Masuku, Micah Bheki; Kirsten, Johann F.; Van Rooyen, C.J. (Cornelius Johannes); Perret, S. (Sylvain)(Agricultural Economics Association of South Africa, 2003-09)