APA Style
Pen, J.. (1965).
Modern economics / J. Pen .
England:
Penguin Books,.
Chicago Style
Pen, J..
Modern economics / J. Pen.
England:
Penguin Books,,
1965.
Text.
MLA Style
Pen, J..
Modern economics / J. Pen.
England:
Penguin Books,,
1965.
Text.
Turabian Style
Pen, J..
Modern economics / J. Pen.
England:
Penguin Books,,
1965.
Print.