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. LB2c8VldPBwPS6+TUC9EACke51LN1Kwp4kkSpycSSlq+HD48gFXJTY7lpNw5Rd4l
