APA (7th ed.) Citation

Enid Blyton. (2014). The Secret Seven: The Humbug Adventure. Hodder.

Chicago Style (17th ed.) Citation

Enid Blyton. The Secret Seven: The Humbug Adventure. London: Hodder, 2014.

MLA (9th ed.) Citation

Enid Blyton. The Secret Seven: The Humbug Adventure. Hodder, 2014.

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