Steel served as the Leader of the Liberal Party from 1976 until its merger with the Social Democratic Party in 1988 to form the Liberal Democrats. He served as a Member of Parliament (MP) from 1965 to 1997 and as a Member of the Scottish Parliament (MSP) from 1999 to 2003.
- O'Grady, Sean (27 October 2007). "David Steel: Liberal conscience". The Independent. London. Retrieved 1 May 2010.