APA (7th ed.) Citation

Jefferies, T. C. (2013). The Postal System of the United States and the New York General Post Office. Project Gutenberg.

Chicago Style (17th ed.) Citation

Jefferies, Thomas C. The Postal System of the United States and the New York General Post Office. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Jefferies, Thomas C. The Postal System of the United States and the New York General Post Office. Project Gutenberg, 2013.

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