Orison Swett Marden (1896). “Pushing to the Front: Or Success Under Difficulties, a Book of Inspiration and Encouragement to All who are Struggling for Self-elevation Along the Paths of Knowledge and of Duty”
"Gresham's Law: Knowledge or Information?". Daniel J. Boorstin's remarks at the White House conference on library and information services in Washington, D.C., November 19, 1979.