APA (7th ed.) Citation

Thoreau, H. D., & Emerson, R. W. (2006). Excursions. Project Gutenberg.

Chicago Style (17th ed.) Citation

Thoreau, Henry David, and Ralph Waldo Emerson. Excursions. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Thoreau, Henry David, and Ralph Waldo Emerson. Excursions. Project Gutenberg, 2006.

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