Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

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