APA (7th ed.) Citation

Thoreau, H. D. (2008). On the Duty of Civil Disobedience. Project Gutenberg.

Chicago Style (17th ed.) Citation

Thoreau, Henry David. On the Duty of Civil Disobedience. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Thoreau, Henry David. On the Duty of Civil Disobedience. Project Gutenberg, 2008.

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