Farb, P. (1963). Face of North America: The natural history of a continent. Harper and Row.
Lua i Stíl Chicago (17ú heag.)Farb, Peter. Face of North America: The Natural History of a Continent. New York: Harper and Row, 1963.
Lua MLA (9ú heag.)Farb, Peter. Face of North America: The Natural History of a Continent. Harper and Row, 1963.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.