Mark A. Kishlansky，ed.， Sources of World History ，New York，Harper Collins，1995，pp. 298-302；http：//www.historyguide.org/europe/churchill.html. axCk6kt8tPyj5w9DKtEQQBYciGAWjQvrHJdPEftxq3fMRm/eP2rVPDhiIenO/r/h
