APA (7th ed.) Citation

Lewis, M., Clark, W., Biddle, N., & Allan Paul. (1966). The expedition of Lewis and Clark. University Microfilms.

Chicago Style (17th ed.) Citation

Lewis, Meriwether, William Clark, Nicholas Biddle, and Allan Paul. The Expedition of Lewis and Clark. Ann Arbor [Mich.]: University Microfilms, 1966.

MLA (9th ed.) Citation

Lewis, Meriwether, et al. The Expedition of Lewis and Clark. University Microfilms, 1966.