APA (7th ed.) Citation

United States. Division of Labor Standards. (1941). Putting National Plumbing Apprenticeship Standards to Work, A Manual Procedure for Establishing Local Joint Plumbing Apprenticeship Standards, Revised July 1941. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Division of Labor Standards. Putting National Plumbing Apprenticeship Standards to Work, A Manual Procedure for Establishing Local Joint Plumbing Apprenticeship Standards, Revised July 1941. [Washington]: [publisher not identified], 1941.

MLA (9th ed.) Citation

United States. Division of Labor Standards. Putting National Plumbing Apprenticeship Standards to Work, A Manual Procedure for Establishing Local Joint Plumbing Apprenticeship Standards, Revised July 1941. [publisher not identified], 1941.