Cita APA (7a ed.)

Richards, D. A. J. (1989). Foundations of American constitutionalism. Oxford University Press.

Cita Chicago Style (17a ed.)

Richards, David A. J. Foundations of American Constitutionalism. New York: Oxford University Press, 1989.

Cita MLA (8a ed.)

Richards, David A. J. Foundations of American Constitutionalism. Oxford University Press, 1989.