APA (7th ed.) Citation

Gardner, E. D., & Howell, S. P. (1926). Blasting to lessen bowlders in hard-ore stopes. U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

Gardner, E. D., and S. P. Howell. Blasting to Lessen Bowlders in Hard-ore Stopes. [Washington?]: U.S. Government Printing Office, 1926.

MLA (9th ed.) Citation

Gardner, E. D., and S. P. Howell. Blasting to Lessen Bowlders in Hard-ore Stopes. U.S. Government Printing Office, 1926.