Sivard, R. L. (1987). World military and social expenditures, 1987-88. World Priorities.
芝加哥风格引文Sivard, Ruth Leger. World Military and Social Expenditures, 1987-88. Washington, D.C: World Priorities, 1987.
MLA引文Sivard, Ruth Leger. World Military and Social Expenditures, 1987-88. World Priorities, 1987.
警告：这些引文格式不一定是100％准确.