Bioleg : y llyfr gwaith haen uwch : gydag atebion /
Parsons, Richard.
Isaac, Colin.
University of Wales, Aberystwyth.Centre for Educational Studies.
Aberystwyth : Y Ganolfan Astudiaethau Addysg,
2001.
Addasiad Cymraeg gan = Welsh adaptation by : Colin Isaac.
Argraffiad Saesneg gwreiddiol = Original English edition : Kirkby-in-Furness : Coordination Group Publications, 2001.
Biology
General Certificate of Secondary Education