APA (7th ed.) Citation

United States. (2007). The Constitution of the United States of America, 1787. Project Gutenberg.

Chicago Style (17th ed.) Citation

United States. The Constitution of the United States of America, 1787. Project Gutenberg, 2007.

MLA (9th ed.) Citation

United States. The Constitution of the United States of America, 1787. Project Gutenberg, 2007.

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