APA (7th ed.) Citation

Enid Blyton. (1943). The Mystery of the strange messages. Hodder Children's Book.

Chicago Style (17th ed.) Citation

Enid Blyton. The Mystery of the Strange Messages. Great Britain: Hodder Children's Book, 1943.

MLA (9th ed.) Citation

Enid Blyton. The Mystery of the Strange Messages. Hodder Children's Book, 1943.

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