APA (7th ed.) Citation

Denny, E. H., & Harrington, D. (1931). Gases that occur in metal mines. U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

Denny, Edward H., and D. Harrington. Gases That Occur in Metal Mines. [Washington?]: U.S. Government Printing Office, 1931.

MLA (9th ed.) Citation

Denny, Edward H., and D. Harrington. Gases That Occur in Metal Mines. U.S. Government Printing Office, 1931.