APA (7th ed.) Citation

United States Bureau of Mines & Smith, W. C. (1993). Roof control strategies for underground coal mines. U.S. Dept. of the Interior, Bureau of Mines.

Chicago Style (17th ed.) Citation

United States Bureau of Mines and William C. Smith. Roof Control Strategies for Underground Coal Mines. Avondale, Md.: U.S. Dept. of the Interior, Bureau of Mines, 1993.

MLA (9th ed.) Citation

United States Bureau of Mines and William C. Smith. Roof Control Strategies for Underground Coal Mines. U.S. Dept. of the Interior, Bureau of Mines, 1993.