APA (7th ed.) Citation

Sullivan, F. W., & Duer, D. (2010). The Wilderness Trail. Project Gutenberg.

Chicago Style (17th ed.) Citation

Sullivan, Francis William, and Douglas Duer. The Wilderness Trail. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Sullivan, Francis William, and Douglas Duer. The Wilderness Trail. Project Gutenberg, 2010.

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