Moderne litteratur Burn, A. R. (1948): . London: English Universities Press. Kagan, Donald (1969): . Ithaca: Cornell University Press. ISBN 0-8014-0501-7. Laistner, M. L. W. (1957): . London: Methuen. McGregor, Malcolm F. (1987): . Vancouver: University of British Columbia Press. ISBN 0-7748-0269-3. Meiggs, Russell (1973): . Oxford: Clarendon Press. ISBN 0-19-814296-X. Sealey, Raphael (1976): Berkeley: University of California Press.