Arweiniad ar unedau'r sgiliau allweddol : cyfathrebu, cymhwyso rhif a thechnoleg gwybodaeth. Lefelau 1-3. ISBN 1861122640. Published by Awdurdod Cymwysterau, Cwricwlwm ac Asesu Cymru in 2000. Publication and catalogue information, links to buy online and reader comments.