Address to the Nation on VietnamWar, 3 Nov. 1969. The term silent majority is found as early as 1870, when the Economist (19 Nov.) referred to "the silent majority which so seldom appears at the polls." See Petronius 2; Edward Young 1
"The Closing of the American Mind: How higher education has failed democracy and impoverished the souls of today's students". Book by Allan Bloom, 1987.
Florence Scovel Shinn (2015). “The Complete Game of Life and How to Play It: The Classic Text with Commentary, Study Questions, Action Items, and Much Mor”, p.31, Hampton Roads Publishing