Andrew Taylor Still (1897). “Autobiography of Andrew T. Still: With a History of the Discovery and Development of the Science of Osteopathy, Together with an Account of the Founding of the American School of Osteopathy”
Sigmund Freud, E. James Lieberman, Robert Kramer, Dr Gregory C Richter (2012). “The Letters of Sigmund Freud and Otto Rank: Inside Psychoanalysis”, p.153, JHU Press