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
John Selden (1800). “The Table-talk: Of John Selden, Esq. Being His Sense of Various Matters of Weight and High Consequence; Relating Especially to Religion and State”, p.75