Deri (ddim) yn dair ar ddeg /
Johnson, Pete,1965-
Davies, Helen Emanuel.
University of Wales, Aberystwyth.Centre for Educational Studies.
Aberystwyth : Ganolfan Astudiaethau Addysg,
2007.
Arg. Saesneg gwreiddiol = Original English ed.: Edinburgh: Barrington Stoke, 2004.
Teenage boys