Mark A. Kishlansky，ed.， Sources of World History ，New York，Harper Collins，1995，pp. 298-302；http：//www.historyguide.org/europe/churchill.html. Yn4VA/UByzKdU/9pbt8WOhZqzlarlPHdsVqSCCON91b+gUuOMvWqqs8NEvA8+cBn
