Cita APA (7th ed.)

John Ferguson,H, & McHenry, D. E. The American System of Government. Oxford University Press.

Cita Chicago (17th ed.)

John Ferguson,H, i Dean E. McHenry. The American System of Government. Oxford: Oxford University Press.

Cita MLA (9th ed.)

John Ferguson,H, i Dean E. McHenry. The American System of Government. Oxford University Press.