APA (7th ed.) Citation

Crowley, W. P., & Reinhardt, J. (1980). Geologic map of the Ellicott City quadrangle, Maryland. Maryland Geological Survey ; Williams & Heintz Map Corp..

Chicago Style (17th ed.) Citation

Crowley, William Patrick, and Juergen Reinhardt. Geologic Map of the Ellicott City Quadrangle, Maryland. Baltimore, Md. : Washington, D.C.: Maryland Geological Survey ; Williams & Heintz Map Corp., 1980.

MLA (9th ed.) Citation

Crowley, William Patrick, and Juergen Reinhardt. Geologic Map of the Ellicott City Quadrangle, Maryland. Maryland Geological Survey ; Williams & Heintz Map Corp., 1980.