APA (7th ed.) Citation

Cullum, R., & Underwood, C. F. (2011). The Trail of the Axe A Story of Red Sand Valley. Project Gutenberg.

Chicago Style (17th ed.) Citation

Cullum, Ridgwell, and Clarence F. Underwood. The Trail of the Axe A Story of Red Sand Valley. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Cullum, Ridgwell, and Clarence F. Underwood. The Trail of the Axe A Story of Red Sand Valley. Project Gutenberg, 2011.

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