アメリカ合衆国副大統領代理
↑ “Mississippians in Washington”. Stennis Center for Public Service. 2007年1月31日閲覧。
↑ Presidential Inability and Vacancies in the Office of Vice President: Hearings before the Subcomm. on Constitutional Amendments of the Senate Comm. on the Judiciary, 88th Cong., 2d Sess. 166 (1964) (statement of Professor Richard Neustadt proposing statutory office of Acting Vice President)