APA (7th ed.) Citation

Thompson, J. M., & Schermeister, P. (2006). Our national parks: Tours with rangers. National Geographic.

Chicago Style (17th ed.) Citation

Thompson, John M., and Phil Schermeister. Our National Parks: Tours with Rangers. Washington, D.C: National Geographic, 2006.

MLA (9th ed.) Citation

Thompson, John M., and Phil Schermeister. Our National Parks: Tours with Rangers. National Geographic, 2006.