APA (7th ed.) Citation

United States. Children's Bureau. (1921). Employment-certificate system, safeguard for working child. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Children's Bureau. Employment-certificate System, Safeguard for Working Child. Washington: U.S. GPO, 1921.

MLA (9th ed.) Citation

United States. Children's Bureau. Employment-certificate System, Safeguard for Working Child. U.S. GPO, 1921.