@book{Black_ebrary, Inc_2003, address={Maidenhead}, title={Assessment for learning: putting it into practice}, url={http://site.ebrary.com/lib/aber/Doc?id=10161348}, publisher={Open University Press}, author={Black, P. J. and ebrary, Inc}, year={2003} }
@book{Brooks_Abbott_Bills_2007, address={Maidenhead}, edition={2nd ed}, title={Preparing to teach in secondary schools: a student teacher’s guide to professional issues in secondary education}, publisher={Open University Press}, author={Brooks, Val and Abbott, Ian and Bills, Liz}, year={2007} }
@book{Geen_2009, address={Caerdydd}, edition={4ydd argraffiad}, title={Addysgu effeithiol ar gyfer yr 21ain ganrif: blaenoriaethau mewn addysg uwchradd}, publisher={Gwasg UWIC}, author={Geen, A. G.}, year={2009} }
@book{Goulding_1997, address={London}, title={Learning to teach mathematics}, publisher={D. Fulton}, author={Goulding, Maria}, year={1997} }