London, 3. U. o. (19). General Certificate of Education Examination: Ordinary level chemistry 2 (Nuffield). London.
Čikaški stil citiranja (17. izdanje)London, 3891 University of. General Certificate of Education Examination: Ordinary Level Chemistry 2 (Nuffield). London, 19.
MLA način citiranja (9. izdanje)London, 3891 University of. General Certificate of Education Examination: Ordinary Level Chemistry 2 (Nuffield). London, 19.
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