APA (7th ed.) Citation

Parkman, F. (2006). The Oregon Trail: Sketches of Prairie and Rocky-Mountain Life. Project Gutenberg.

Chicago Style (17th ed.) Citation

Parkman, Francis. The Oregon Trail: Sketches of Prairie and Rocky-Mountain Life. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Parkman, Francis. The Oregon Trail: Sketches of Prairie and Rocky-Mountain Life. Project Gutenberg, 2006.

Warning: These citations may not always be 100% accurate.