Cummings, M. C. (1971). Democracy under pressure: An introduction to the American political system (2nd.ed.). Harcourt Brace Jovanovich.
芝加哥风格引文Cummings, Milton C. Democracy Under Pressure: An Introduction to the American Political System. 2nd.ed. New York: Harcourt Brace Jovanovich, 1971.
MLA引文Cummings, Milton C. Democracy Under Pressure: An Introduction to the American Political System. 2nd.ed. Harcourt Brace Jovanovich, 1971.
警告：这些引文格式不一定是100％准确.