APA (7th ed.) Citation

Enid Blyton. (2007). The Secret Seven (1st.). Hodder Children's Book.

Chicago Style (17th ed.) Citation

Enid Blyton. The Secret Seven. 1st. UK: Hodder Children's Book, 2007.

MLA (9th ed.) Citation

Enid Blyton. The Secret Seven. 1st. Hodder Children's Book, 2007.

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