van der Walt, M., J. Maree, and S. Ellis. “An Investigation Regarding Metacognition in the Learning of Mathematics in the Senior Phase”. Suid-Afrikaans Tydskrif Vir Natuurwetenskap En Tegnologie / <i>South African Journal of Science and Technology</I&gt;, Vol. 25, no. 3, Sept. 2006, pp. 177-94, doi:10.4102/satnt.v25i3.159.