1. De Villiers, Michael. (2010). Some Reflections on the Van Hiele Theory, Invited plenary from 4th Congress of teachers of mathematics, Zagreb. (Available from: http://math.kennesaw.edu/∼mdevilli/vanhiele-reflection.pdf).
2. Havigerová, Jana Marie, & Burešová Iva (2013). The Ability of Young Children to Ask Questions: More Questions, More Intelligent Child? The International Journal of Early Childhood Learning, 20(1), 63-73.
3. Haviger, Jiří, Vojkůvková, Iva. (2013). “The van Hiele Geometry Thinking Levels: Gender and School Type Differences.” Procedia - Social and Behavioral Sciences.
4. Mind map for the Van Hiele Model of Geometric Thought, E-learning.(Available from: http://gogeometry.com/mindmap/van_hiele_geometry_level.html).
5. Usiskin, Zalman. (1982). Van Hiele Levels and Achievement in Secondary School Geometry, University of Chicago,.