APA (7th ed.) Citation

O'Reilly, S., O'Reilly, J., & Habegger, L. (1999). Grand Canyon: True stories of life below the rim. Travelers Tales.

Chicago Style (17th ed.) Citation

O'Reilly, Sean, James O'Reilly, and Larry Habegger. Grand Canyon: True Stories of Life Below the Rim. San Francisco, Calif.: Travelers Tales, 1999.

MLA (9th ed.) Citation

O'Reilly, Sean, et al. Grand Canyon: True Stories of Life Below the Rim. Travelers Tales, 1999.