Mark A. Kishlansky，ed.， Sources of World History ，New York，Harper Collins，1995，pp. 298-302；http：//www.historyguide.org/europe/churchill.html. iqP+HOPjixU1fQCb6PIzxonZw1bVFIDstruWwkWy+lR/Oqh7678tov1oaa9EgbWn
