De Villiers, Charl Johannes(Independent Regulatory Board for Auditors (IRBA), South African Institute of Chartered Accountants (SAICA) and Southern African Accounting Association (SAAA), 2000)
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)