Nodyn ar ben y wyneb ddalen = Note at head of title page: Sefydliad Cenedlaethol er Ymchwil i Addysg yn Lloegr a Chymru [= National Foundation for Educational Research in England and Wales].
Teithio. ISBN 1856440389. Published by Canolfan Astudiaethau Addysg in 1991. Publication and catalogue information, links to buy online and reader comments.