APA (7th ed.) Citation

Blyton, E. King Arthur and his knights. W. & A.K. Johnston.

Chicago Style (17th ed.) Citation

Blyton, Enid. King Arthur and His Knights. London, etc: W. & A.K. Johnston.

MLA (9th ed.) Citation

Blyton, Enid. King Arthur and His Knights. W. & A.K. Johnston.

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