APA (7th ed.) Citation

Gray, Andrews, & Wallis. (2002). The rough guide to Britain. Rough Guides.

Chicago Style (17th ed.) Citation

Gray, Andrews, and Wallis. The Rough Guide to Britain. [ ?]: Rough Guides, 2002.

MLA (8th ed.) Citation

Gray, et al. The Rough Guide to Britain. Rough Guides, 2002.