Douglas Fairbanks, Samuel Smiles, Charles F. Haanel, James Allen, Russell H. Conwell, B.F. Austin, Florence Scovel Shinn, H.A. Lewis, Sun Tzu, Abner Bayley, L.W. Rogers, Henry H. Brown, Orison Swett Marden, William Crosbie Hunter, Henry Thomas Hamblin, P.T. Barnum, Wallace D. Wattles, William Atkinson, Various authors, Dale Carnegie, Ralph Waldo Emerson, Lao Tzu

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