Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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