1. The persistence of early childhood maturity: International evidence of long-run age effects;Bedard;The Quarterly Journal of Economics,2006
2. Blatchford , P. Hallam , S. Ireson , J. Kutnick , P. Creech , A. 2008 Classes, groups and transitions: Structures for teaching and learning http://www.primaryreview.org.uk/Downloads/Int_Reps/9.Teaching-learning/RS_9-2_briefing_160508_Structures_for_teaching_learning.pdf
3. The impact of age and gender on Prep children's academic achievements;Boardman;Australian Journal of Early Childhood,2006
4. Burgess , S. Greaves , E. 2009 Test scores, subjective assessment and stereotyping of ethnic minorities http://www.bris.ac.uk/cmpo/publications/papers/2009/wp221.pdf
5. Campbell , T. 2013 In-school ability-grouping and the month of birth effect: Preliminary evidence from the Millennium Cohort Study http://www.cls.ioe.ac.uk/shared/get-file.ashx?itemtype=document&id=1618