"Cargo Cult Science". Richard P. Feynman's Caltech commencement address (1974), as quoted in "'Surely You're Joking, Mr. Feynman!': Adventures of a Curious Character" edited by Ralph Leighton (p. 342), calteches.library.caltech.edu. 1985.
Thomas Jefferson (1853). “The writings of Thomas Jefferson: being his autobiography, correspondence, reports, messages, addresses, and other writings, official and private”, p.389