Seymore, Reyno; Adams, Philip D.; Chitiga-Mabugu, Margaret; Van Heerden, J.H. (Jan Horn), 1957-; Blignaut, James Nelson(Bureau for Economic Research and the Graduate School of Business, University of Stellenbosch, 2010)
Van Heerden, Neels, 1957-; Van Heerden, Cornelius Hendrik, 1957-; Kuiper, Angelique; Saar, Honorata Maria(Southern African Alliance for Sport Science, Physical Education and Recreation, 2008)
Kasselmann, B. von H.; De Beer, J.J. (Johannes Jacobus), 1947-; Vermeulen, Leopold Petrus(Faculty of Economic and Management Sciences, University of Pretoria, 2002-03)