Cornwell, R. D. (1980). World history in the twentieth century (New ed.). Longman.
芝加哥风格引文Cornwell, R. D. World History in the Twentieth Century. New ed. Harlow: Longman, 1980.
MLA引文Cornwell, R. D. World History in the Twentieth Century. New ed. Longman, 1980.
警告：这些引文格式不一定是100％准确.