APA (7th ed.) Citation

Carr, M. S. (1950). The District of Columbia, its rocks and their geologic history. U.S. G.P.O.

Chicago Style (17th ed.) Citation

Carr, Martha S. The District of Columbia, Its Rocks and Their Geologic History. Washington [D.C.]: U.S. G.P.O, 1950.

MLA (9th ed.) Citation

Carr, Martha S. The District of Columbia, Its Rocks and Their Geologic History. U.S. G.P.O, 1950.