Arg. Saesneg gwreiddiol o = Original English ed: Harlow: Longman Group, 1992.
Teitl clawr = Cover title.
Cyhoeddwyd dan nawdd Cynllun Adnoddau Cyd-bwyllgor Addysg Cymru = Published under the auspices of the Welsh Joint Education Committee Resource Project.
Testun tu mewn i'r cloriau = Text on inside covers.
Egni'r ddaear by Gabrielle McSharry. ISBN 1873649398. Published by Qualitex mewn cydweithrediad â Longman Group in 1994. Publication and catalogue information, links to buy online and reader comments.