Tracy, M. (1964). Agriculture in Western Europe. Praeger.
Lua i Stíl Chicago (17ú heag.)Tracy, Michael. Agriculture in Western Europe. New York: Praeger, 1964.
Lua MLA (9ú heag.)Tracy, Michael. Agriculture in Western Europe. Praeger, 1964.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.