Dyfyniad APA

Catrin Brown. (2014). Higher level Chemistry (2nd edition.). Pearson education.

Dyfyniad Arddull Chicago

Catrin Brown. Higher Level Chemistry. 2nd edition. Essex: Pearson education, 2014.

Dyfyniad MLA

Catrin Brown. Higher Level Chemistry. 2nd edition. Pearson education, 2014.

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