Vincent van Gogh, Vincent Willem Gogh (1927). “The Letters of Vincent Van Gogh to His Brother, 1872-1886: With a Memoir by His Sister-in-law, J. Van Gogh-Bonger ...”
John Bunyan, Thomas Scott (1825). “The Pilgrim's Progress: From this World to that which is to Come. Delivered Under the Similitude of a Dream. In Two Parts”, p.161
Richard P. Feynman (2010). “"Surely You're Joking, Mr. Feynman!": Adventures of a Curious Character: Adventures of a Curious Character”, p.172, W. W. Norton & Company