Henry David Thoreau (2014). “Citizen Thoreau: Walden, Civil Disobedience, Life Without Principle, Slavery in Massachusetts, A Plea for Captain John Brown”, p.42, Graphic Arts Books
Mahatma Gandhi (1965). “Glorious Thoughts of Gandhi: Being a Treasury of about Ten Thousand Valuable and Inspiring Thougths of Mahatma Gandhi, Classified Under Four Hundred Subjects”