Gaya APA
Ayer, Aj. (1973).
The Central question of philosophy .
New York:
Penguin Books.
Gaya Chicago
Ayer, Aj.
The Central question of philosophy.
New York:
Penguin Books,
1973.
Text.
Gaya MLA
Ayer, Aj.
The Central question of philosophy.
New York:
Penguin Books,
1973.
Text.
Gaya Turabian
Ayer, Aj.
The Central question of philosophy.
New York:
Penguin Books,
1973.
Print.