Donald Markwell(d) (1986), 'Sir Alfred Zimmern Revisited: Fifty Years On', Review of International Studies. Donald Markwell(d), 'Sir Alfred Eckhard Zimmern', Oxford Dictionary of National Biography, 2004.
E.g. Donald Markwell(d), John Maynard Keynes and International Relations: Economic Paths to War and Peace, Oxford University Press,2006,7.
