Robert Owen (1841). “A development of the principles and plans on which to establish self-supporting home colonies: as a most secure and profitable investment for capital, and an effectual means permanently to remove the causes of ignorance, poverty, and crime”, p.7
Noah Webster (1835). “Instructive and Entertaining Lessons for Youth: With Rules for Reading with Propriety, Illustrated by Examples: Designed for Use in Schools and Families”, p.230
Albert Einstein (2015). “Bite-Size Einstein: Quotations on Just About Everything from the Greatest Mind of the Twentieth Century”, p.24, St. Martin's Press