Nathaniel Branden (2011). “How to Raise Your Self-Esteem: The Proven Action-Oriented Approach to Greater Self-Respect and Self-Confidence”, p.83, Bantam
Ralph Waldo Emerson (1844). “An Address Delivered in the Court-house in Concord, Massachusetts, on 1st August, 1844: On the Anniversary of the Emancipation of the Negroes in the British West Indies”, p.30