APA

Thybony S., National Geographic Society U.S, . (1993). Canyon country parklands: treasures of the Great Plateau. Washington, D.C: National Geographic Society.

Chicago

Thybony Scott, National Geographic Society U.S, . 1993. Canyon country parklands: treasures of the Great Plateau. Washington, D.C: National Geographic Society.

Harvard

Thybony S., National Geographic Society U.S, . (1993). Canyon country parklands: treasures of the Great Plateau. Washington, D.C: National Geographic Society.

MLA

Thybony Scott, National Geographic Society U.S, . Canyon country parklands: treasures of the Great Plateau. Washington, D.C: National Geographic Society. 1993.