APA (7th ed.) Citation

Blyton, E. (1991). Adventure of the strange ruby. Red Fox.

Chicago Style (17th ed.) Citation

Blyton, Enid. Adventure of the Strange Ruby. Red Fox, 1991.

MLA (8th ed.) Citation

Blyton, Enid. Adventure of the Strange Ruby. Red Fox, 1991.

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