APA

Athearn R. G., . (1960). High country empire: the high plains and Rockies. New York: McGraw-Hill.

Chicago

Athearn Robert G, . 1960. High country empire: the high plains and Rockies. New York: McGraw-Hill.

Harvard

Athearn R. G., . (1960). High country empire: the high plains and Rockies. New York: McGraw-Hill.

MLA

Athearn Robert G, . High country empire: the high plains and Rockies. New York: McGraw-Hill. 1960.