Book Reviews : Encyclopedia of China Today. Frederic M. Kaplan, Julian M. Sobin and Stephen Andors. Macmillan Press. 15.00. China, the United Nations and World Order. Samuel S. Kim. Princeton University Press. Cloth 20.40. Paper 7.90. Go Gently Through Peking: A Westerner's Life in China. Lois Fisher. Souvenir Press. 6.25. Dragon and Eagle: United States China Relations Past and Future. Edited by Michael Oksenberg and Robert B. Oxnam. Harper & Row. 8.80. P'yongyang Between Peking and Moscow. Chin O. Chung. University of Alabama Press. 10.50