Jennings, Jay, ed. Escape Velocity: A Charles Portis Miscellany. Little Rock: Butler Center for Arkansas Studies, 2012.
Kibler, James E., Jr., ed. Dictionary of Literary Biography. American Novelists since World War II. Second Series. Detroit: Gale, 1980.
Park, Ed. "Like Cormac McCarthy, But Funny." Believer magazine, March 2003.
The unofficial Charles Portis website includes lists and links to many articles about the author and reviews of all of his books
U.S. Marshals Service
The official website of the United States Marshals Service includes a timeline and much history and background information