Cita APA (7a ed.)

Somerville, C., & Wright, A. (2011). National Geographic traveler: Great Britain (Third edition.). National Geographic Society.

Cita Chicago Style (17a ed.)

Somerville, Christopher, y Alison Wright. National Geographic Traveler: Great Britain. Third edition. Washington, D.C: National Geographic Society, 2011.

Cita MLA (9a ed.)

Somerville, Christopher, y Alison Wright. National Geographic Traveler: Great Britain. Third edition. National Geographic Society, 2011.