APA (7th ed.) Zitazioa

Ellsworth, J. W. (1976). Politics and political systems: An introduction to political science. McGraw-Hill.

Chicago Style (17th ed.) Zitazioa

Ellsworth, John W. Politics and Political Systems: An Introduction to Political Science. New York: McGraw-Hill, 1976.

MLA (9th ed.) Zitazioa

Ellsworth, John W. Politics and Political Systems: An Introduction to Political Science. McGraw-Hill, 1976.