Ralph Waldo Emerson (195?). “The works of Ralph Waldo Emerson in one volume: including the poems, philosophic and inspirational essays, and biographical studies”
Ralph Waldo Emerson, Robert Ernest Spiller, Alfred Riggs Ferguson, Joseph Slater, Jean Ferguson Carr (1971). “The Collected Works of Ralph Waldo Emerson: Nature, addresses, and lectures”, p.39, Harvard University Press