Botha, Hanlie; Maree, J.G. (Kobus); Stols, Gerrit Hendrikus(Faculty of Education, University of the Free State (since April 2010) For older articles: Faculty of Education, University of Pretoria, 2013-12)
Gaigher, Estelle; Rogan, John M.; Braun, Max Willi Hermann(Southern African Association for Research in Mathematics, Science and Technology Education, 2006)