APA (7th ed.) Citation

Thoreau, H. D., & Sanborn, F. B. (2013). The Writings of Henry David Thoreau, Volume VI, Familiar Letters. Project Gutenberg.

Chicago Style (17th ed.) Citation

Thoreau, Henry David, and F. B. Sanborn. The Writings of Henry David Thoreau, Volume VI, Familiar Letters. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Thoreau, Henry David, and F. B. Sanborn. The Writings of Henry David Thoreau, Volume VI, Familiar Letters. Project Gutenberg, 2013.

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