Cita APA (7a ed.)

O'Hear, A., & Honderich, T. (1991). What philosophy is: An introduction to contemporary philosophy. Penguin Books.

Cita Chicago Style (17a ed.)

O'Hear, Anthony, y Ted Honderich. What Philosophy Is: An Introduction to Contemporary Philosophy. Harmondsworth: Penguin Books, 1991.

Cita MLA (9a ed.)

O'Hear, Anthony, y Ted Honderich. What Philosophy Is: An Introduction to Contemporary Philosophy. Penguin Books, 1991.