Cynhyrchwyd ar ran Cyngor Cwricwlwm Cymru = Produced on behalf of the Curriculum Council for Wales.
Dyn ac anifail : tasgau : rhan o ddeunydd Project Cyngor Cwricwlwm Cymru: Ehangu gorwelion by Esyllt Maelor. ISBN 1856442330. Published by Canolfan Astudiaethau Addysg in 1993. Publication and catalogue information, links to buy online and reader comments.