Mark A. Kishlansky，ed.， Sources of World History ，New York，Harper Collins，1995，pp. 298-302；http：//www.historyguide.org/europe/churchill.html. pD8eGTuLuSRjonab3GIzsgAzAKFJLD1FcVwYwXOUCSU+C4h0poUR9Upe5iAS3rG1
