APA (7th ed.) Citation

Gregor, E. R. (1913). Camping on western trails: Adventures of two boys in the Rocky Mountains. Harper & brothers.

Chicago Style (17th ed.) Citation

Gregor, Elmer Russell. Camping on Western Trails: Adventures of Two Boys in the Rocky Mountains. New York, London: Harper & brothers, 1913.

MLA (9th ed.) Citation

Gregor, Elmer Russell. Camping on Western Trails: Adventures of Two Boys in the Rocky Mountains. Harper & brothers, 1913.