CUMMINGS, M. C. (1981). Democracy Under Pressure An Introduction To The American Political System Milton C. Cummings; David Wise. Harcourt Brace Jovanovich.
Lua i Stíl Chicago (17ú heag.)CUMMINGS, Milton C. Democracy Under Pressure An Introduction To The American Political System Milton C. Cummings; David Wise. Harcourt Brace Jovanovich, 1981.
Lua MLA (8ú heag.)CUMMINGS, Milton C. Democracy Under Pressure An Introduction To The American Political System Milton C. Cummings; David Wise. Harcourt Brace Jovanovich, 1981.
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