Mark A. Kishlansky，ed.， Sources of World History ，New York，Harper Collins，1995，pp. 298-302；http：//www.historyguide.org/europe/churchill.html. kN2SORF/kaUaAYlDApO2b/rtOerfzoYbkd05WD6ntuZC8843cxvPPJRsM5QZVvuP
