Henry David Thoreau (2014). “Citizen Thoreau: Walden, Civil Disobedience, Life Without Principle, Slavery in Massachusetts, A Plea for Captain John Brown”, p.216, Graphic Arts Books
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”