APA (7th ed.) Citation

Danko, G. M., & Carlson, E. (1981). Potomac River basin: An annotated bibliography. U.S. G.P.O..

Chicago Style (17th ed.) Citation

Danko, George M., and Elaine Carlson. Potomac River Basin: An Annotated Bibliography. Washington: U.S. G.P.O., 1981.

MLA (9th ed.) Citation

Danko, George M., and Elaine Carlson. Potomac River Basin: An Annotated Bibliography. U.S. G.P.O., 1981.