ISBN 978-0-19-860669-7. Retrieved May 14, 2022.
Schaller, Michael (2004). "Reagan, Ronald Wilson". American National Biography. Oxford University Press. doi:10.1093/anb/9780198606697.article.0700791. ISBN 978-0-19-860669-7. Retrieved May 14, 2022.
Shade, William G. (2000) [1999]. "Tyler, John". American National Biography. Oxford University Press. doi:10.1093/anb/9780198606697.article.0401004. ISBN 978-0-19-860669-7. Retrieved May 14, 2022.
Smith, Elbert B. (2000) [1999]. "Taylor, Zachary". American National Biography. Oxford University Press. doi:10.1093/anb/9780198606697.article.0400978. ISBN 978-0-19-860669-7. Retrieved May 14, 2022.
Spetter, Allan Burton (2000) [1999]. "Harrison, Benjamin". American National Biography. Oxford University Press. doi:10.1093/anb/9780198606697.article.0500320. ISBN 978-0-19-860669-7. Retrieved May 14, 2022.
Trefousse, Hans L. (2000) [1999]. "Johnson, Andrew". American National Biography. Oxford University Press. doi:10.1093/anb/9780198606697.article.0400566. ISBN 978-0-19-860669-7. Retrieved May 14, 2022.
"James Carter". whitehouse.gov. Retrieved May 14, 2022.
"George H. W. Bush". whitehouse.gov. Retrieved May 14, 2022.
"William J. Clinton". whitehouse.gov. Retrieved May 14, 2022.
"George W. Bush". whitehouse.gov. Retrieved May 14, 2022.
"Barack Obama". whitehouse.gov. Retrieved May 14, 2022.
"Donald Trump". whitehouse.gov. Retrieved May 14, 2022.
"Joe Biden". whitehouse.gov. Retrieved May 14, 2022.
Online sources

Jamison, Dennis (December 31, 2014). "George Washington' Views on Political Parties in America". The Washington Times. Retrieved February 20, 2020.
"Creating the United States: Formation of Political Parties". Library of Congress. Retrieved July 31, 2022.
"President's Swearing-in Ceremony". 