APA (7th ed.) Citation

(1924). U.S. Government master specification for coal-tar pitch for roofing. U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

U.S. Government Master Specification for Coal-tar Pitch for Roofing. [Washington?]: U.S. Government Printing Office, 1924.

MLA (9th ed.) Citation

U.S. Government Master Specification for Coal-tar Pitch for Roofing. U.S. Government Printing Office, 1924.