APA (7th ed.) Citation

Lucy, H. (2007). George's Secret Key To The Universe. Doubleday.

Chicago Style (17th ed.) Citation

Lucy, Hawking. George's Secret Key To The Universe. London: Doubleday, 2007.

MLA (9th ed.) Citation

Lucy, Hawking. George's Secret Key To The Universe. Doubleday, 2007.

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