Arg Saesneg gwreiddiol = Original English ed: 1990, rev 1992.
Cyfieithiad gan = Translation by: W.J. Jones.
Bwlian : ymateb positif : cyngor i rieni, llywodraethwyr a staff mewn ysgolion by Delwyn P. Tattum. Published by Athrofa Addysg Uwch Caerdydd in 1993. Publication and catalogue information, links to buy online and reader comments.