APA (7th ed.) Citation

(1925). U.S. Government master specification for indigo blue denim (unshrunk). U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

U.S. Government Master Specification for Indigo Blue Denim (unshrunk). [Washington?]: U.S. Government Printing Office, 1925.

MLA (9th ed.) Citation

U.S. Government Master Specification for Indigo Blue Denim (unshrunk). U.S. Government Printing Office, 1925.