APA (7th ed.) Citation

Geological Survey (U.S.), Spudich, P., Bakun, W. H., Prescott, W. H., & Havach, G. A. (1997). The Loma Prieta, California, earthquake of October 17, 1989--main-shock characteristics. U.S. G.P.O..

Chicago Style (17th ed.) Citation

Geological Survey (U.S.), Paul Spudich, W. H. Bakun, William H. Prescott, and George A. Havach. The Loma Prieta, California, Earthquake of October 17, 1989--main-shock Characteristics. Washington, D.C.: U.S. G.P.O., 1997.

MLA (9th ed.) Citation

Geological Survey (U.S.), et al. The Loma Prieta, California, Earthquake of October 17, 1989--main-shock Characteristics. U.S. G.P.O., 1997.