APA (7th ed.) Citation

Hennessy. (1975). Essentials of public opinion. Duxbury Press.

Chicago Style (17th ed.) Citation

Hennessy. Essentials of Public Opinion. Massachusetts: Duxbury Press, 1975.

MLA (8th ed.) Citation

Hennessy. Essentials of Public Opinion. Duxbury Press, 1975.

Warning: These citations may not always be 100% accurate.