1884 The Duke's version of Hamlet's soliloquy, combining elements of other speeches by Hamlet and pieces of Macbeth. The Adventures of Huckleberry Finn, ch.21.
William Shakespeare (1823). “The Dramatic Works of William Shakspeare: From the Text of Johnson, Stevens, and Reed; with Glossarial Notes, His Life, and a Critique on His Genius & Writings”, p.920
William Shakespeare, Nick De Somogyi (2001). “Hamlet: The Tragedie of Hamlet, Prince of Denmarke : the First Folio of 1623 and a Parallel Modern Edition”, p.106, Nick Hern Books