APA (7th ed.) Citation

Gallagher, W. (2017). How the post office created America: A history. Penguin Books.

Chicago Style (17th ed.) Citation

Gallagher, Winifred. How the Post Office Created America: A History. New York, New York: Penguin Books, 2017.

MLA (9th ed.) Citation

Gallagher, Winifred. How the Post Office Created America: A History. Penguin Books, 2017.

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