Anderson, R. Y. (1999). First steps to a physical basis of concentration: An initial strategy for parents and teachers relating to learning and behaviour problems. Carmarthen: Crown House Publishing.

Anderson, Roy Y. First Steps to a Physical Basis of Concentration: An Initial Strategy for Parents and Teachers Relating to Learning and Behaviour Problems. Carmarthen: Crown House Publishing, 1999.

Anderson, Roy Y. First Steps to a Physical Basis of Concentration: An Initial Strategy for Parents and Teachers Relating to Learning and Behaviour Problems. Carmarthen: Crown House Publishing, 1999.