Citazione Stile APA (7a Edizione)

O'Hear, A. (1985). What philosophy is: An introduction to contemporary philosophy (6th ed.). Penguin Books ; New York, N.Y. : Viking Penguin.

Citazione stile Chigago Style (17a edizione)

O'Hear, Anthony. What Philosophy Is: An Introduction to Contemporary Philosophy. 6th ed. Harmondsworth, England: Penguin Books ; New York, N.Y. : Viking Penguin, 1985.

Citatione MLA (9a ed.)

O'Hear, Anthony. What Philosophy Is: An Introduction to Contemporary Philosophy. 6th ed. Penguin Books ; New York, N.Y. : Viking Penguin, 1985.