Gallagher, W. (2016). How the post office created America: A history. Penguin Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGallagher, Winifred. How the Post Office Created America: A History. New York: Penguin Press, 2016.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGallagher, Winifred. How the Post Office Created America: A History. Penguin Press, 2016.
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