APA
O'Hear Anthony,, . (1985). What philosophy is : An introduction to contemporary philosophy. London: Penguin Books.
Chicago
O'Hear Anthony,, . 1985. What philosophy is : An introduction to contemporary philosophy. London: Penguin Books.
Harvard
O'Hear Anthony,, . (1985). What philosophy is : An introduction to contemporary philosophy. London: Penguin Books.
MLA
O'Hear Anthony,, . What philosophy is : An introduction to contemporary philosophy. London: Penguin Books. 1985.