APA (7th ed.) Citation

Berkowitz, A. (1970). Grand Canyon trail guide: Bright Angel [trail]. [Grand Canyon Natural History Association].

Chicago Style (17th ed.) Citation

Berkowitz, Alan. Grand Canyon Trail Guide: Bright Angel [trail]. [Grand Canyon National Park]: [Grand Canyon Natural History Association], 1970.

MLA (9th ed.) Citation

Berkowitz, Alan. Grand Canyon Trail Guide: Bright Angel [trail]. [Grand Canyon Natural History Association], 1970.