Cita APA

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

Citación estilo Chicago

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

Cita MLA

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