Mark A. Kishlansky，ed.， Sources of World History ，New York，Harper Collins，1995，pp. 298-302；http：//www.historyguide.org/europe/churchill.html. jsWaJmzbx3T1oKHIbtdvw5hJQbInD8ojYDLHonCWBAU6m2Y/4FuivHExhi041MVE
