APA (7th ed.) Citation

United States. Congress. Senate & ProQuest (Firm). (2008). Pro Term: Presidents Pro Tempore of the U.S. Senate Since 1789. [U.S. G.P.O.].

Chicago Style (17th ed.) Citation

United States. Congress. Senate and ProQuest (Firm). Pro Term: Presidents Pro Tempore of the U.S. Senate Since 1789. [Washington]: [U.S. G.P.O.], 2008.

MLA (9th ed.) Citation

United States. Congress. Senate and ProQuest (Firm). Pro Term: Presidents Pro Tempore of the U.S. Senate Since 1789. [U.S. G.P.O.], 2008.