APA (7th ed.) Citation

Duigon, M. T., & Hilleary, J. T. (1981). Hydrogeologic atlas, Hereford quadrangle, Baltimore County, Maryland. Maryland Geological Survey.

Chicago Style (17th ed.) Citation

Duigon, Mark T., and John T. Hilleary. Hydrogeologic Atlas, Hereford Quadrangle, Baltimore County, Maryland. [Baltimore, Md.]: Maryland Geological Survey, 1981.

MLA (9th ed.) Citation

Duigon, Mark T., and John T. Hilleary. Hydrogeologic Atlas, Hereford Quadrangle, Baltimore County, Maryland. Maryland Geological Survey, 1981.