Mark Twain (2014). “Mark Twain on Common Sense: Timeless Advice and Words of Wisdom from America's Most-Revered Humorist”, p.60, Skyhorse Publishing, Inc.
Jeff VanVonderen (2008). “Tired of Trying to Measure Up: Getting Free from the Demands, Expectations, and Intimidation of Well-Meaning People”, p.87, Bethany House