APA (7th ed.) Citation

United States. Second Congress of the United States: At the first session, begun and held at the city of Philadelphia, in the state of Pennsylvania, on Monday the twenty-fourth of October, one thousand seven hundred and ninety-one. : An act to establish the post-office and post-roads within the United States.

Chicago Style (17th ed.) Citation

United States. Second Congress of the United States: At the First Session, Begun and Held at the City of Philadelphia, in the State of Pennsylvania, on Monday the Twenty-fourth of October, One Thousand Seven Hundred and Ninety-one. : An Act to Establish the Post-office and Post-roads Within the United States.

MLA (9th ed.) Citation

United States. Second Congress of the United States: At the First Session, Begun and Held at the City of Philadelphia, in the State of Pennsylvania, on Monday the Twenty-fourth of October, One Thousand Seven Hundred and Ninety-one. : An Act to Establish the Post-office and Post-roads Within the United States.

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