Ralph Emerson (2014). “Ralph Waldo Emerson on Self-Reliance: Advice, Wit, and Wisdom from the Father of Transcendentalism”, p.14, Skyhorse Publishing, Inc.
Ralph Waldo Emerson (2004). “A Dream Too Wild: Emerson Meditations for Every Day of the Year”, p.20, Unitarian Universalist Association of Congregations
Ralph Waldo Emerson, Robert Ernest Spiller, Alfred Riggs Ferguson, Joseph Slater, Jean Ferguson Carr (1971). “The Collected Works of Ralph Waldo Emerson: Essays, second series”, p.137, Harvard University Press