Mark A. Kishlansky，ed.， Sources of World History ，New York，Harper Collins，1995，pp. 298-302；http：//www.historyguide.org/europe/churchill.html. PnYyZBOfpxd3QlnyLk9SBXGCrdug0p338qrwAv8P2Z1MSbQICqXdc/dFnA7cdsNd
