APA (7th ed.) Citation

Eckel, E. B., Galbraith, F. W., & Williams, J. S. (1949). Geology and ore deposits of the La Plata district, Colorado. United States Department of the Interior, Geological Survey.

Chicago Style (17th ed.) Citation

Eckel, Edwin Butt, Frederic W. Galbraith, and James Steele Williams. Geology and Ore Deposits of the La Plata District, Colorado. Washington: United States Department of the Interior, Geological Survey, 1949.

MLA (9th ed.) Citation

Eckel, Edwin Butt, et al. Geology and Ore Deposits of the La Plata District, Colorado. United States Department of the Interior, Geological Survey, 1949.