APA Citation

Porcella, R. L., & Zwitzer, J. C. (1989). Catalogue of U.S. Geological survey strong-motion records, 1987. Washington: U.S. Geological Survey.

Chicago Style Citation

Porcella, Ronald L., and Josephine C. Zwitzer. Catalogue of U.S. Geological Survey Strong-motion Records, 1987. Washington: U.S. Geological Survey, 1989.

MLA Citation

Porcella, Ronald L., and Josephine C. Zwitzer. Catalogue of U.S. Geological Survey Strong-motion Records, 1987. Washington: U.S. Geological Survey, 1989.

Warning: These citations may not always be 100% accurate.