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."
Meriwether Lewis, William Clark, Thomas Rees (2010). “Travels to the Source of the Missouri River: And Across the American Continent to the Pacific Ocean 1804, 1805, and 1806”, p.213, Cambridge University Press