Mark A. Kishlansky，ed.， Sources of World History ，New York，Harper Collins，1995，pp. 298-302；http：//www.historyguide.org/europe/churchill.html. e5Rv+1usYU+46Xt+d3tEr2Kp9OGaQXfxGWxEkja4Zd4ugbGG3wxr70uyyAzA2K+q
