APA (7th ed.) Citation

Gray,Clio. (2006). Guardians of the key. Headline Book Publishing.

Chicago Style (17th ed.) Citation

Gray,Clio. Guardians of the Key. London: Headline Book Publishing, 2006.

MLA (9th ed.) Citation

Gray,Clio. Guardians of the Key. Headline Book Publishing, 2006.

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