Não informado. (1921). Survey of Current Business. U.S. Department of Commerce.
Chicago-Zitierstil (17. Ausg.)Não informado. Survey of Current Business. Washington: U.S. Department of Commerce, 1921.
MLA-Zitierstil (8. Ausg.)Não informado. Survey of Current Business. U.S. Department of Commerce, 1921.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.