Schulz, E. B. (1958). Essentials of government. Prentice-Hall.
Cita Chicago (17th ed.)Schulz, Ernst Bernhard. Essentials of Government. Englewood Cliffs, N.J: Prentice-Hall, 1958.
Cita MLA (9th ed.)Schulz, Ernst Bernhard. Essentials of Government. Prentice-Hall, 1958.
Atenció: Aquestes cites poden no estar 100% correctes.