APA (7th ed.) Citation

Enid Blyton. (1990). In The Fifth at Malory Towers (1st.). Armada.

Chicago Style (17th ed.) Citation

Enid Blyton. In The Fifth at Malory Towers. 1st. UK: Armada, 1990.

MLA (9th ed.) Citation

Enid Blyton. In The Fifth at Malory Towers. 1st. Armada, 1990.

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