Cita APA (7a ed.)

Barber, N. W. (2010). The constitutional state (1st. ed.). Oxford University Press.

Cita Chicago Style (17a ed.)

Barber, N. W. The Constitutional State. 1st. ed. Oxford [etc]: Oxford University Press, 2010.

Cita MLA (9a ed.)

Barber, N. W. The Constitutional State. 1st. ed. Oxford University Press, 2010.