Não informado. (1970). Commerce today. U.S. Department of Commerce.
Lua i Stíl Chicago (17ú heag.)Não informado. Commerce Today. Washington: U.S. Department of Commerce, 1970.
Lua MLA (8ú heag.)Não informado. Commerce Today. U.S. Department of Commerce, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.