Booysen, G.; Truscott, M.; Mosimanyane, D.; De Beer, D.(Interim : Interdisciplinary Journal, Vol 8, Issue 2: Central University of Technology Free State Bloemfontein, 2009)
Truscott, M.; Booysen, G.J.; De Beer, D.J.(Interim : Interdisciplinary Journal, Vol 8, Issue 2: Central University of Technology Free State Bloemfontein, 2009)