George Washington (1835). “The writings of George Washington: being his correspondence, addresses, messages, and other papers, official and private, selected and published from the original manuscripts; with a life of the author, notes, and illustrations”, p.206
H. Jackson Brown Jr. (2007). “Complete Life's Little Instruction Book: 1,560 Suggestions, Observations, and Reminders on How to Live a Happy and Rewarding Life”, p.177, Thomas Nelson Inc