APA (7th ed.) Citation

Ellis, W. S., & Durrance, D. (1976). The majestic Rocky Mountains. The National Geographic Society.

Chicago Style (17th ed.) Citation

Ellis, William S., and Dick Durrance. The Majestic Rocky Mountains. Washington: The National Geographic Society, 1976.

MLA (9th ed.) Citation

Ellis, William S., and Dick Durrance. The Majestic Rocky Mountains. The National Geographic Society, 1976.

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