APA (7th ed.) Citation

Enid Blyton. (1957). The Secret Seven Mystery: Secret Seven Mystery. Hodder Children's Books.

Chicago Style (17th ed.) Citation

Enid Blyton. The Secret Seven Mystery: Secret Seven Mystery. Great Britain: Hodder Children's Books, 1957.

MLA (9th ed.) Citation

Enid Blyton. The Secret Seven Mystery: Secret Seven Mystery. Hodder Children's Books, 1957.

Warning: These citations may not always be 100% accurate.