Truter, Wayne Frederick; Botha, Philip R.; Dannhauser, Chris S.; Maasdorp, Barbara V.; Miles, Neil; Smith, Albert; Snyman, Hennie A.; Tainton, Neil M.(Taylor & Francis, 2015-04)
Svinurai, Walter; Hassen, Abubeker; Tesfamariam, Eyob Habte; Ramoelo, Abel(NISC (Pty) Ltd and Informa UK Limited (trading as Taylor & Francis Group), 2021)