Oswald Chambers (2015). “Our Brilliant Heritage / If You Will Be Perfect / Disciples Indeed: The Inheritance of God's Transforming Mind & Heart”, p.337, Discovery House
Henry David Thoreau (2014). “Citizen Thoreau: Walden, Civil Disobedience, Life Without Principle, Slavery in Massachusetts, A Plea for Captain John Brown”, p.216, Graphic Arts Books
Ralph Waldo Emerson, Robert Ernest Spiller, Alfred Riggs Ferguson, Joseph Slater, Jean Ferguson Carr (1971). “The Collected Works of Ralph Waldo Emerson: Nature, addresses, and lectures”, p.52, Harvard University Press