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- Gallagher, W. (2020, August 21). A Brief History of the United States Postal Service. Smithsonian Magazine. https://www.smithsonianmag.com/smithsonian-institution/brief-history-united-states-postal-service-180975627/
- Hand, G. (2019, June 18). Send Your Kids To Grandma Through the U.S. Mail! Cincinnati Curiosities. https://handeaux.tumblr.com/post/185676843780/send-your-kids-to-grandma-through-the-us-mail
- Little, B. (2020, August 21). When People Used the Postal Service to Mail ...