Erwin Raphael McManus (2004). “The Uprising Experience: A Personal Guide for a Revolution of the Soul, Promise Keepers Edition”, p.52, Thomas Nelson Inc
Thomas Overbury (1856). “The miscellaneous works in prose and verse of Sir Thomas Overbury, now first collected: Edited with notes, and a biograph. account of the author by E. F. Rimbault”, p.190
Quoted in Project Cyclops: A Design Study of a System for Detecting Extraterrestrial Intelligent Life, rev. ed., ed. B. M. Oliver and J. Billingham (1973). An earlier version by A. R. Burn appeared in a book review by Burn in The Classical Review, June 1969: "absence of evidence is not identical with evidence of absence."
Dr. Robert C. Worstell, Dorothea Brande, Claude M. Bristol, Earl Nightingale, Napoleon Hill (2017). “Mindset StackingTM Inspirational Journal VolumeSS01”, p.16, Lulu.com
Ralph Waldo Emerson (2010). “Essays and English Traits by Ralph Waldo Emerson: The Five Foot Shelf of Classics, Vol. V (in 51 Volumes)”, p.217, Cosimo, Inc.