Παραπομπή APA

U.S. department of commerce. (1921). Survey of current business. U.S. department of commerce.

Παραπομπή Chicago Style

U.S. department of commerce. Survey of Current Business. Washington D.C: U.S. department of commerce, 1921.

Παραπομπή MLA

U.S. department of commerce. Survey of Current Business. U.S. department of commerce, 1921.