APA (7th ed.) Citation

Enid Blyton. (1946). The Mystery of the Spiteful Letters. Egmont.

Chicago Style (17th ed.) Citation

Enid Blyton. The Mystery of the Spiteful Letters. Great Britain: Egmont, 1946.

MLA (9th ed.) Citation

Enid Blyton. The Mystery of the Spiteful Letters. Egmont, 1946.

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