Book Reviews : America's Foreign Policy. Edited with Introduction and Notes by Harold Karan Jacobson. New York. Random House. $6.50 Political Realism and the Crisis of World Politics. An American Approach to Foreign Policy. Kenneth W. Thompson. Princeton University. London. Oxford University Press. 40s. America and the World of Our Time. United States Diplomacy in the 20th Century. Jules Davids. New York. Random House. $7.50. The United States and World Affairs 1960. Richard P. Stebbins. New York. Harper for the Council on Foreign Relations. London. Oxford University Press. 48s. Documents on American Foreign Relations 1960. Edited by Richard P. Stebbins and Elaine P. Adam. New York. Harper for the Council on Foreign Relations. London. Oxford University Press. 56s