Mark A. Kishlansky，ed.， Sources of World History ，New York，Harper Collins，1995，pp. 298-302；http：//www.historyguide.org/europe/churchill.html. A9DxywpwYj7v6jyQsJzL0Y6dt242S8/uZHi/GnVe47Fman0fT9NtBeee2R+bzher
