Goosen, Hendrik Jacobus (Henri)(University of Pretoria. Faculty of Engineering, Built Environment and Information Technology. Dept. of Construction Economics, 2012-08-02)
Marais, L.D.(University of Pretoria. Faculty of Engineering, Built Environment and Information Technology. Dept. of Industrial and Systems Engineering, 2012)
De Boer, Ann-Louise; Du Toit, Pieter Hertzog; Bothma, T.J.D. (Theodorus Jan Daniel)(Vaal Triangle Faculty of Northwest University in South Africa, 2015-11)