Burtt, E. J. (1979). labor in the American economy. St. Martin's Press.
Lua i Stíl Chicago (17ú heag.)Burtt, Everett Johnson. Labor in the American Economy. New York: St. Martin's Press, 1979.
Lua MLA (9ú heag.)Burtt, Everett Johnson. Labor in the American Economy. St. Martin's Press, 1979.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.