Scherman, Vanessa; Zimmerman, Lisa; Howie, Sarah J.; Bosker, Roel(Faculty of Education, University of the Free State (since April 2010) For older articles: Faculty of Education, University of Pretoria, 2014-03)
Ngololo, E.N. (Elizabeth Ndeukumwa); Howie, Sarah J.; Plomp, Tjeerd(Southern African Association for Research in Mathematics, Science and Technology Education, 2012)