Jansen, B. R. J. (2001). Development of reasoning on the balance scale task : psychometric assessment of cognitive strategies. [Thesis, fully internal, Universiteit van Amsterdam].
Welsh, M. C., & Huizinga, M. (2001). The development and preliminary validation of the Tower of Hanoi-Revised. Assessment, 8(2), 167-176. https://doi.org/10.1177/107319110100800205
Ponsioen, A. J. G. B. (2001). Cognitieve vaardigheden van licht verstandelijk gehandicapte kinderen en jongeren. [Thesis, externally prepared, Universiteit van Amsterdam].
van der Maas, H. L. J. (1993). Catastrophe analysis of stagewise cognitive development: Model, method and applications. [Thesis, fully internal, Universiteit van Amsterdam]. University of Amsterdam.
Welsh, M. C., & Huizinga, M. (2001). The development and preliminary validation of the Tower of Hanoi-Revised. Assessment, 8(2), 167-176. https://doi.org/10.1177/107319110100800205