Karl Rahner, Albert Raffelt, Harvey D. Egan (1993). “The Great Church Year: The Best of Karl Rahner's Homilies, Sermons, and Meditations”, Crossroad Publishing Company
Henry David Thoreau (2014). “Citizen Thoreau: Walden, Civil Disobedience, Life Without Principle, Slavery in Massachusetts, A Plea for Captain John Brown”, p.152, Graphic Arts Books