Henry David Thoreau, Barry Andrews (2005). “True Harvest: Readings from Henry David Thoreau for Every Day of the Year”, p.29, Unitarian Universalist Association of Congregations
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”