APA-ийн эшлэл(7 дахь хэвлэлт)

Cummings, M. C. (1971). Democracy under pressure: An introduction to the American political system (2nd.ed.). Harcourt Brace Jovanovich.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Cummings, Milton C. Democracy Under Pressure: An Introduction to the American Political System. 2nd.ed. New York: Harcourt Brace Jovanovich, 1971.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Cummings, Milton C. Democracy Under Pressure: An Introduction to the American Political System. 2nd.ed. Harcourt Brace Jovanovich, 1971.