Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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