Aristotle (2004). “The Works of Aristotle: Aristotle on the parts & progressive motion of animals, the problems, on indivisible lines to which is added Thomas Taylor's The elements of the true arithmetic of infinites”
Douglas Adams (2012). “The Hitchhiker's Guide to the Galaxy Radio Scripts Volume 2: The Tertiary, Quandary and Quintessential Phases”, p.292, Pan Macmillan
William Shakespeare, John Payne Collier, Charles Knight (1847). “Romeo and Juliet. Othello. Hamlet. Macbeth. King Lear. Cymbeline. Timon of Athens. Coriolanus. Julius Caesar. Anthony and Cleopatra. Troilus and Cressida. Titus Andronicus. Pericles”