APA (7th ed.) Citation

Geological Survey (U.S.), Finn, C., Phillips, W. M., & Williams, D. L. (1991). Gravity anomaly and terrain maps of Washington. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.), C. Finn, William Morton Phillips, and D. L. Williams. Gravity Anomaly and Terrain Maps of Washington. Reston, Va.: The Survey, 1991.

MLA (9th ed.) Citation

Geological Survey (U.S.), et al. Gravity Anomaly and Terrain Maps of Washington. The Survey, 1991.