Cox, R., & Brna, P. (1994). Supporting the use of external representations in problem solving: The need for flexible learning environments.
Chicago-Zitierstil (17. Ausg.)Cox, Richard, und Paul Brna. Supporting the Use of External Representations in Problem Solving: The Need for Flexible Learning Environments. Edinburgh, 1994.
MLA-Zitierstil (9. Ausg.)Cox, Richard, und Paul Brna. Supporting the Use of External Representations in Problem Solving: The Need for Flexible Learning Environments. 1994.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.