Gaya APA
PEN, J.. (1965).
Modern Economics .
Australia:
Penguin Books.
Gaya Chicago
PEN, J..
Modern Economics.
Australia:
Penguin Books,
1965.
Monograf.
Gaya MLA
PEN, J..
Modern Economics.
Australia:
Penguin Books,
1965.
Monograf.
Gaya Turabian
PEN, J..
Modern Economics.
Australia:
Penguin Books,
1965.
Monograf.