APA (7th ed.) Citation

United States. National Bureau of Standards. (1941). Survey of roofing materials in the North Central States. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. National Bureau of Standards. Survey of Roofing Materials in the North Central States. [Washington]: [publisher not identified], 1941.

MLA (9th ed.) Citation

United States. National Bureau of Standards. Survey of Roofing Materials in the North Central States. [publisher not identified], 1941.