APA (7th ed.) Citation

United States. Government Printing Office. (1931). Operation of typesetting machine (slug casting). GPO.

Chicago Style (17th ed.) Citation

United States. Government Printing Office. Operation of Typesetting Machine (slug Casting). [Washington]: GPO, 1931.

MLA (9th ed.) Citation

United States. Government Printing Office. Operation of Typesetting Machine (slug Casting). GPO, 1931.

Warning: These citations may not always be 100% accurate.