APA

Fenneman N. M., . (1931). Physiography of Western United States. New York: McGraw-Hill.

Chicago

Fenneman Nevin M, . 1931. Physiography of Western United States. New York: McGraw-Hill.

Harvard

Fenneman N. M., . (1931). Physiography of Western United States. New York: McGraw-Hill.

MLA

Fenneman Nevin M, . Physiography of Western United States. New York: McGraw-Hill. 1931.