William Shakespeare, John Payne Collier (1858). “Titus Andronicus. Romeo and Juliet. Timon of Athens. Julius Caesar. Macbeth. Hamlet. King Lear”, p.268
Ralph Waldo Emerson, Alfred R. Ferguson (1965). “Journals and Miscellaneous Notebooks of Ralph Waldo Emerson, Volume V: 1835-1838”, p.50, Harvard University Press