FIREFLY BOOKS. (2012). FIREFLY GENERAL KNOWLEDGE - BOOK 5. FIREFLY PUBLICATIONS.
Čikaški stil citiranja (17. izdanje)FIREFLY BOOKS. FIREFLY GENERAL KNOWLEDGE - BOOK 5. FIREFLY PUBLICATIONS, 2012.
MLA način citiranja (9. izdanje)FIREFLY BOOKS. FIREFLY GENERAL KNOWLEDGE - BOOK 5. FIREFLY PUBLICATIONS, 2012.
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