Henry David Thoreau, Horace Elisha Scudder, Harrison Gray Otis Blake, Ralph Waldo Emerson, Franklin Benjamin Sanborn (1803). “The Writings of Henry David Thoreau”, p.408
Leo Tolstoy (2016). “THE KINGDOM OF GOD IS WITHIN YOU (One of the Most Influential Books on Nonviolent Resistance, Christianity & Inner Fate): What It Means To Be A True Christian At Heart – Crucial Book for Understanding Tolstoyan, Nonviolent Resistance and Christian Anarchist Movements”, p.146, e-artnow