Não informado. (1921). Survey of Current Business. U.S. Department of Commerce.
Lua i Stíl Chicago (17ú heag.)Não informado. Survey of Current Business. Washington: U.S. Department of Commerce, 1921.
Lua MLA (8ú heag.)Não informado. Survey of Current Business. U.S. Department of Commerce, 1921.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.