1. Principles and Standards for School Mathematics,2000
2. Investigating the effect of van Hiele phase-based instruction on preservice teachers’ geometric thinking;Robert;Int. J. Educ. Sci.,2018
3. Gender differences in spatial ability: Implications for STEM education and approaches to reducing the gender gap for parents and educators;Reilly,2017
4. Van Hiele Levels and Achievement in Secondary School Geometry;Usiskin,1982