Hart, R.A., Moro M., Roberts J.E., 'Date of birth, family background, and the 11 plus exam: short- and long-term consequences of the 1944 secondary education reforms in England and Wales', Stirling Economics Discussion Paper 2012–10
May 2012 pp. 6 to 25. https://dspace.stir.ac.uk/bitstream/1893/6612/1/SEDP-2012-10-Hart-Moro-Roberts.pdf