Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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