Dyfyniad APA

Earl , B., & Wilford L . D . R. (1998). Revision for chemistry GCSE with answers. John murray publishers.

Dyfyniad Arddull Chicago

Earl , B., and Wilford L . D . R. Revision for Chemistry GCSE with Answers. London: John murray publishers, 1998.

Dyfyniad MLA

Earl , B., and Wilford L . D . R. Revision for Chemistry GCSE with Answers. John murray publishers, 1998.

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