APA (7th ed.) Citation

Enid Blyton. (1957). The mystery of the Strange Messages. Egmont.

Chicago Style (17th ed.) Citation

Enid Blyton. The Mystery of the Strange Messages. London: Egmont, 1957.

MLA (9th ed.) Citation

Enid Blyton. The Mystery of the Strange Messages. Egmont, 1957.

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