U.S. Political Stats draws on a number of authoritative CQ Press and other sources for biographical data.

For Presidents and Vice Presidents:

• American Political Leaders, 1789-2009. Washington: CQ Press, 2010.
• Nelson, Michael, ed. Guide to the Presidency and the Executive Branch, 5th ed. Washington: CQ Press, 2012.
• Ragsdale, Lyn. Vital Statistics on the Presidency, 4th Edition. Washington: CQ Press, 2014.

For members of Congress:

• Biographical Directory of the American Congress 1774-1996. Alexandria, VA: CQ Staff Directories, 1996.
• CQ's Politics in America 1998. The 105th Congress. Washington: CQ Press, 1997.
• CQ's Politics in America 2000. The 106th Congress. Washington: CQ Press, 1999.
• CQ's Politics in America 2002. The 107th Congress. Washington: CQ Press, 2001.
• CQ's Politics in America 2004. The 108th Congress. Washington: CQ Press, 2003.
• CQ's Politics in America 2006. The 109th Congress. Washington: CQ Press, 2005.
• CQ's Politics in America 2008. The 110th Congress. Washington: Congressional Quarterly, 2007.
• CQ's Politics in America 2010. The 111th Congress. Washington: Congressional Quarterly, 2009.
• Politics in America 2012. The 112th Congress. Washington: CQ-Roll Call, Inc., 2011.
• Politics in America 2014. The 113th Congress. Washington: CQ-Roll Call, Inc., 2013.

For Supreme Court Justices:

• Lee Epstein, Jeffrey A. Segal, Harold J. Spaeth & Thomas G. Walker, The Supreme Court Compendium: Data, Decisions, and Developments, 5th ed. Washington: CQ Press, 2012.