APA (7th ed.) Citation

Alvord, D. C., & Holbrook, C. E. (1965). Geologic map of the Pikeville quadrangle, Pike and Floyd Counties, Kentucky. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Alvord, Donald C., and Charles E. Holbrook. Geologic Map of the Pikeville Quadrangle, Pike and Floyd Counties, Kentucky. Washington, D.C.: U.S. Geological Survey, 1965.

MLA (9th ed.) Citation

Alvord, Donald C., and Charles E. Holbrook. Geologic Map of the Pikeville Quadrangle, Pike and Floyd Counties, Kentucky. U.S. Geological Survey, 1965.