Labor Research Association (U.S.) & Labor Research Association (U.S.). (1972). Labor fact book. Oriole Editions.
Lua i Stíl Chicago (17ú heag.)Labor Research Association (U.S.) agus Labor Research Association (U.S.). Labor Fact Book. New York: Oriole Editions, 1972.
Lua MLA (8ú heag.)Labor Research Association (U.S.) agus Labor Research Association (U.S.). Labor Fact Book. Oriole Editions, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.