Somerville, C. (2010). National Geographic traveler: Ireland (Third edition.). National Geographic Society.
Chicago-referens (17:e uppl.)Somerville, Christopher. National Geographic Traveler: Ireland. Third edition. Washington, D.C: National Geographic Society, 2010.
MLA-referens (9:e uppl.)Somerville, Christopher. National Geographic Traveler: Ireland. Third edition. National Geographic Society, 2010.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.