APA (7th ed.) Citation

Billingsley, G. H., Block, D. L., & Redsteer, M. H. (2013). Geologic map of the eastern quarter of the Flagstaff 30ʹ x 60ʹ quadrangle, Coconino County, northern Arizona. U.S. Department of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Billingsley, George H., Debra L. Block, and Margaret H. Redsteer. Geologic Map of the Eastern Quarter of the Flagstaff 30ʹ X 60ʹ Quadrangle, Coconino County, Northern Arizona. [Reston, Va.]: U.S. Department of the Interior, U.S. Geological Survey, 2013.

MLA (9th ed.) Citation

Billingsley, George H., et al. Geologic Map of the Eastern Quarter of the Flagstaff 30ʹ X 60ʹ Quadrangle, Coconino County, Northern Arizona. U.S. Department of the Interior, U.S. Geological Survey, 2013.