APA (7th ed.) Citation

Fenneman, N. M. (1964). Physical divisions of the United States (Ed. of 1946.). Geological Survey.

Chicago Style (17th ed.) Citation

Fenneman, Nevin Melancthon. Physical Divisions of the United States. Ed. of 1946. Washington, D.C.: Geological Survey, 1964.

MLA (9th ed.) Citation

Fenneman, Nevin Melancthon. Physical Divisions of the United States. Ed. of 1946. Geological Survey, 1964.