APA (7th ed.) Citation

Thybony Scot & Chesley, P. The rockies: Pillars of a continent. D.C..

Chicago Style (17th ed.) Citation

Thybony Scot and Paul Chesley. The Rockies: Pillars of a Continent. Washington: D.C..

MLA (9th ed.) Citation

Thybony Scot and Paul Chesley. The Rockies: Pillars of a Continent. D.C..

Warning: These citations may not always be 100% accurate.