APA način citiranja (7. izdanje)
O'Brien Derek. (2004). Gk with derek the ultimate general knowledge and quiz compendium: 3 science and wildlife. Penguin Books.
Čikaški stil citiranja (17. izdanje)
O'Brien Derek. Gk with Derek the Ultimate General Knowledge and Quiz Compendium: 3 Science and Wildlife. New Delhi: Penguin Books, 2004.
MLA način citiranja (9. izdanje)
O'Brien Derek. Gk with Derek the Ultimate General Knowledge and Quiz Compendium: 3 Science and Wildlife. Penguin Books, 2004.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.