APA (7th ed.) Citation

Lucy Hawking & Stephen Hawking. George's cosmic treasure hunt. Corgi.

Chicago Style (17th ed.) Citation

Lucy Hawking and Stephen Hawking. George's Cosmic Treasure Hunt. London: Corgi.

MLA (9th ed.) Citation

Lucy Hawking and Stephen Hawking. George's Cosmic Treasure Hunt. Corgi.

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