APA (7th ed.) Citation

Seaber, P. R., Kapinos, F. P., & Knapp, G. L. (1987). Hydrologic unit maps. U.S. G.P.O. ; For sale by the Books and Open-File Reports Section, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Seaber, Paul R., F. Paul Kapinos, and George L. Knapp. Hydrologic Unit Maps. [Washington] : Denver, CO: U.S. G.P.O. ; For sale by the Books and Open-File Reports Section, U.S. Geological Survey, 1987.

MLA (8th ed.) Citation

Seaber, Paul R., et al. Hydrologic Unit Maps. U.S. G.P.O. ; For sale by the Books and Open-File Reports Section, U.S. Geological Survey, 1987.