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William Cowper (1856). “The task, Table talk, and other poems: With critical observations of various authors on his genius and character, and notes, critical and illustrative”, p.271
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.10, Harvard University Press