Enid Blyton. (2018). The Secret Seven, Mystery of the Skull (2018.). Hodder Children's book.
Cita Chicago (17th ed.)Enid Blyton. The Secret Seven, Mystery of the Skull. 2018. Hodder Children's book, 2018.
Cita MLA (9th ed.)Enid Blyton. The Secret Seven, Mystery of the Skull. 2018. Hodder Children's book, 2018.
Atenció: Aquestes cites poden no estar 100% correctes.