Barroll, J. Leeds (2001): . Philadelphia: University of Pennsylvania Press ISBN 0-8122-3574-6. Davies, Godfrey ([1937] 1959): . Oxford: Clarendon Press ISBN 0-19-821704-8. DeFord, Miriam Allen (1960): . Philadelphia: Chilton Company. Lindley, David (1993): . London: Routledge ISBN 0-415-05206-8. Perry, Curtis (2006): . Cambridge; New York: Cambridge University Press ISBN 0-521-85405-9. Stewart, Alan (2003): . London: Chatto and Windus. ISBN 0-7011-6984-2. Willson, David Harris ([1956] 1963 red): . London: Jonathan Cape ISBN 0-224-60572-0.