APA Style
Pen, J. (1958).
Modern Economics .
England:
Penguin Books.
Chicago Style
Pen, J.
Modern Economics.
England:
Penguin Books,
1958.
Text.
MLA Style
Pen, J.
Modern Economics.
England:
Penguin Books,
1958.
Text.
Turabian Style
Pen, J.
Modern Economics.
England:
Penguin Books,
1958.
Print.