http：//www.nsarchive.gwu.edu/coldwar/documents/episode-1/kennan.html；“The Charge in the Soviet Union（Kennan）to the Secretary of State”， FRUS ，Vol.6，1946，pp.696-709. EPkAQD9D5iB0LwuGg1gr5bdfJMcMsxMKhzGumtMVwXj8S04joo+t1EeaIHIm11nD
