APA (7th ed.) Citation

Parkman, F., & Guthrie, A. B., Jr. (1978). The Oregon Trail. New American Library.

Chicago Style (17th ed.) Citation

Parkman, Francis, and A. B. Guthrie, Jr. The Oregon Trail. New York: New American Library, 1978.

MLA (9th ed.) Citation

Parkman, Francis, and A. B. Guthrie, Jr. The Oregon Trail. New American Library, 1978.