APA (7th ed.) Citation

Ampian, S. G., & Virta, R. L. (1992). Crystalline silica overview: Occurence and analysis. U.S. Dept. of the Interior.

Chicago Style (17th ed.) Citation

Ampian, Sarkis G., and Robert L. Virta. Crystalline Silica Overview: Occurence and Analysis. [Washington, D.C.]: U.S. Dept. of the Interior, 1992.

MLA (9th ed.) Citation

Ampian, Sarkis G., and Robert L. Virta. Crystalline Silica Overview: Occurence and Analysis. U.S. Dept. of the Interior, 1992.