APA (7th ed.) Citation

Association of American Geographers & Hart, J. F. (1972). Regions of the United States. Harper & Row.

Chicago Style (17th ed.) Citation

Association of American Geographers and John Fraser Hart. Regions of the United States. New York: Harper & Row, 1972.

MLA (9th ed.) Citation

Association of American Geographers and John Fraser Hart. Regions of the United States. Harper & Row, 1972.

Warning: These citations may not always be 100% accurate.