APA (7th ed.) Citation

United States. Bureau of Standards. (1931). X-ray protection. U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

United States. Bureau of Standards. X-ray Protection. [Washington?]: U.S. Government Printing Office, 1931.

MLA (9th ed.) Citation

United States. Bureau of Standards. X-ray Protection. U.S. Government Printing Office, 1931.

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