Mark A. Kishlansky，ed.， Sources of World History ，New York，Harper Collins，1995，pp. 298-302；http：//www.historyguide.org/europe/churchill.html. wwoCtHxCHIhL2r7Nk2yLghG7FwIiKxdKCpbWAaJcElceTCk5MTH2R8mVlfAd2hTF
