Johnston-Wilder, S. & Mason, J. (eds.) (2005)
Developing Thinking in Geometry
London, Open University & Paul Chapman Publishing
Brown, M., Jones, K. & Taylor, R. (2003)
Developing Geometrical Reasoning in the Secondary School
: Outcomes of Trialling Teaching Activities in Classrooms.
Qualification and Curriculum Authority.
Developing Reasoning through Algebra and Geometry
, mathematics resources provided by the Qualifications and Curriculum Authority (QCA)