Supplementary education
Gordon Edmund W., Bridglall Beatrice L., Meroe Aundra SaaKniha
Citace v seznamu literatury:
GORDON, Edmund W.; BRIDGLALL, Beatrice L. a MEROE, Aundra Saa (ed.). Supplementary education: the hidden curriculum of high academic achievement. Lanham: Rowman & Littlefield Publishers, c2005. ISBN 0742542610. Dostupné také z: http://www.loc.gov/catdir/toc/ecip0417/2004009250.html.