Cita APA (7a ed.)

Pen, J. (1972). Modern economics ([Reprinted].). Penguin Books.

Cita Chicago Style (17a ed.)

Pen, Jan. Modern Economics. [Reprinted]. Harmondsworth [etc.]: Penguin Books, 1972.

Cita MLA (9a ed.)

Pen, Jan. Modern Economics. [Reprinted]. Penguin Books, 1972.