Cita APA (7th ed.)
Richards, D. A. J. (1989). Foundations of American constitutionalism. Oxford University Press.
Cita Chicago (17th ed.)
Richards, David A. J. Foundations of American Constitutionalism. New York: Oxford University Press, 1989.
Cita MLA (9th ed.)
Richards, David A. J. Foundations of American Constitutionalism. Oxford University Press, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.