Mark Twain, John Sutton Tuckey (1980). “The Devil's Race-track: Mark Twain's Great Dark Writings : the Best from Which was the Dream? and Fables of Man”, p.7, Univ of California Press
Lysander Spooner (1886). “A Letter to Grover Cleveland on His False Inaugural Address, the Usurpation and Crimes of Lawmakers and Judges, and Consequent Poverty, Ignorance, and Servitude of the People”
Orison Swett Marden (2015). “ORISON SWETT MARDEN Premium Collection - Wisdom & Empowerment Series (18 Books in One Volume): Steps to Success and Power, How to Get What You Want, An Iron Will, Be Good to Yourself, Every Man A King, Keeping Fit, Prosperity – How to Attract It, Stepping-Stones To Fame And Fortune...”, p.2455, e-artnow