APA (7th ed.) Citation

Geological Survey, Finn, C., Phillips, W. M., & Williams, D. L. (1991). Gravity anomaly and terrain maps of Washington. The Survey ; For sale by Map Distribution.

Chicago Style (17th ed.) Citation

Geological Survey, C. Finn, William Morton Phillips, and D. L. Williams. Gravity Anomaly and Terrain Maps of Washington. Reston, Va. : Denver, CO: The Survey ; For sale by Map Distribution, 1991.

MLA (8th ed.) Citation

Geological Survey, et al. Gravity Anomaly and Terrain Maps of Washington. The Survey ; For sale by Map Distribution, 1991.