APA (7th ed.) Citation

Snyder, G. S., & Russell, C. M. (1970). In the footsteps of Lewis and Clark. National Geographic Society.

Chicago Style (17th ed.) Citation

Snyder, Gerald S., and Charles M. Russell. In the Footsteps of Lewis and Clark. Washington: National Geographic Society, 1970.

MLA (9th ed.) Citation

Snyder, Gerald S., and Charles M. Russell. In the Footsteps of Lewis and Clark. National Geographic Society, 1970.