Gaigher, Estelle; Rogan, John M.; Braun, Max Willi Hermann(Southern African Association for Research in Mathematics, Science and Technology Education, 2006)
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)