Mugido, Worship; Blignaut, James Nelson; Joubert, Matthew; De Wet, John; Knipe, Andrew; Joubert, Selmé; Cobbing, Ben; Jansen, James; Le Maitre, D.C. (David Carlyle); Van der Vyfer, Marius(Academy of Science of South Africa, 2014)
Niemann-Struweg, Ilse; Meintjes, Corne; Grobler, Anske F.(Unit for Community Communication, Dept of Communication and Information Studies, University of the Free State, 2007)