APA (7th ed.) Citation

Humphreys, R. (2002). The Rough guide to London (4. ed., repr.). Rough Guides.

Chicago Style (17th ed.) Citation

Humphreys, Rob. The Rough Guide to London. 4. ed., repr. London: Rough Guides, 2002.

MLA (9th ed.) Citation

Humphreys, Rob. The Rough Guide to London. 4. ed., repr. Rough Guides, 2002.