Cita APA (7a ed.)

Plumb, J. H. (1964). Crisis in the humanities. Penguin Books.

Cita Chicago Style (17a ed.)

Plumb, J. H. Crisis in the Humanities. Baltimore: Penguin Books, 1964.

Cita MLA (8a ed.)

Plumb, J. H. Crisis in the Humanities. Penguin Books, 1964.