Cita APA (7th ed.)

Ward, R. E. (1963). Modern political systems: Europe. Prentice-Hall.

Cita Chicago (17th ed.)

Ward, Robert E. Modern Political Systems: Europe. Englewood Cliffs, N. J: Prentice-Hall, 1963.

Cita MLA (9th ed.)

Ward, Robert E. Modern Political Systems: Europe. Prentice-Hall, 1963.