1. W. G. Martin, Principles and Standards for School Mathematics (National Council of Teachers of Mathematics, Reston, Virginia, USA, 2000).
2. A case study on the investigation of reasoning skills in geometry
3. Students’ reasoning in mathematics textbook task-solving
4. A. J. Stylianides and G. J. Stylianides, “Content knowledge for mathematics teaching: the case of reasoning and proving,” in Psychology of Mathematical Education Annual Conference, Proceedings of 30th Conference of the Psychology of Mathematics Education, edited by J. Novotná et al. (International Group for the Psychology of Mathematics Education, Pretoria, South Africa, 2006), pp. 201–208.
5. Reasoning and proof in geometry: effects of a learning environment based on heuristic worked-out examples