Enid Blyton. (2018). The Secret Seven, Mystery of the Skull (2018.). Hodder Children's book.
Čikaški stil citiranja (17. izdanje)Enid Blyton. The Secret Seven, Mystery of the Skull. 2018. Hodder Children's book, 2018.
MLA način citiranja (9. izdanje)Enid Blyton. The Secret Seven, Mystery of the Skull. 2018. Hodder Children's book, 2018.
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