Venter, Elmar Retief; Stiglingh, M. (Madeleine)(Independent Regulatory Board for Auditors (IRBA), South African Institute of Chartered Accountants (SAICA) and Southern African Accounting Association (SAAA), 2006)
North, Ernest J.; Millard, Sollie M.(Innovatio Publishers (Germany), Media Tenor (South Africa) and the Institute for Media Analysis in South Africa (Imasa), 2003)