Bausum, A., & Dickerson, J. (2021). Our country's presidents: A complete encyclopedia of the U.S. presidency : featuring election 2020 (2020 edition.). National Geographic.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBausum, Ann, और John Dickerson. Our Country's Presidents: A Complete Encyclopedia of the U.S. Presidency : Featuring Election 2020. 2020 edition. Washington, D.C.: National Geographic, 2021.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBausum, Ann, और John Dickerson. Our Country's Presidents: A Complete Encyclopedia of the U.S. Presidency : Featuring Election 2020. 2020 edition. National Geographic, 2021.
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