APA (7th ed.) Citation

Blyton. (1997). The Mystery of the Secret Room. Mammoth.

Chicago Style (17th ed.) Citation

Blyton. The Mystery of the Secret Room. Great Britain: Mammoth, 1997.

MLA (9th ed.) Citation

Blyton. The Mystery of the Secret Room. Mammoth, 1997.

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