Cita APA

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

Citación estilo Chicago

Snyder, Gerald S., y Gerald S. Snyder. In the Footsteps of Lewis and Clark. Washington, D.C.: National Geographic Society, 1970.

Cita MLA

Snyder, Gerald S., y Gerald S. Snyder. In the Footsteps of Lewis and Clark. Washington, D.C.: National Geographic Society, 1970.