"Gustine, Amos" (G000533), in Biographical Directory of the United States Congress. Washington, D.C.: Offices of the Historians of the U.S. House of Representatives and U.S. Senate, retrieved online, March 2, 2023.
politicalgraveyard.com
"Gustine, Amos." Ann Arbor, Michigan: The Political Graveyard, May 10, 2022.