Chrimes, Stanley B. ([1972] 1999): , New Haven: Yale University Press, 2. utg., ISBN 978-0-520-02266-9 Guy, John, red. (1997): . St Martin's Press. O'Day, Rosemary (2012): , Routledge, ISBN 978-1-136-96253-0; s. 27–28. Turton, Godfrey (1970): . Peter Davies. Smith, Lacey Baldwin (1992): , D.C. Heath and Co., Lexington, Mass., OCLC 24849088.