APA

Fenneman N. M., . (1938). Physiography of Eastern United States. New York: McGraw-Hill.

Chicago

Fenneman Nevin M, . 1938. Physiography of Eastern United States. New York: McGraw-Hill.

Harvard

Fenneman N. M., . (1938). Physiography of Eastern United States. New York: McGraw-Hill.

MLA

Fenneman Nevin M, . Physiography of Eastern United States. New York: McGraw-Hill. 1938.