Basson, N. J.S., Departement Onderwys- en Opleidingskunde, Fakulteit Opvoedkunde, Universiteit van Pretoria, Pretoria, South Africa

• Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / <i>South African Journal of Science and Technology</i> Vol 20 No 3/4 (2001) - Oorspronklike Navorsing
  Optimising learning competencies of grade 9 learners: A comparison between a few subject didactic measuring instruments.
  Abstract  PDF
• Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / <i>South African Journal of Science and Technology</i> Vol 20 No 3/4 (2001) - Oorspronklike Navorsing
  Optimising learning competencies of grade 9 learners: A comparison between a few subject didactic measuring instruments.
  Abstract  PDF