APA (7th ed.) Citation

Dunlop, F., & Soriano, T. (2013). National Geographic traveler: Portugal (Second edition.). National Geographic Society.

Chicago Style (17th ed.) Citation

Dunlop, Fiona, and Tino Soriano. National Geographic Traveler: Portugal. Second edition. Washington, D.C: National Geographic Society, 2013.

MLA (9th ed.) Citation

Dunlop, Fiona, and Tino Soriano. National Geographic Traveler: Portugal. Second edition. National Geographic Society, 2013.