APA (7th ed.) Zitazioa
(1921). Annual Report of the Secretary of Labor. Gov.Print.Office.
Chicago Style (17th ed.) Zitazioa
Annual Report of the Secretary of Labor. Washington: Gov.Print.Office, 1921.
MLA (9th ed.) Zitazioa
Annual Report of the Secretary of Labor. Gov.Print.Office, 1921.
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