APA Citation

Pen, J. (1972). Modern economics: .P456 1972. Baltimore: Penguin Books.

Chicago Style Citation

Pen, J. Modern Economics: .P456 1972. Baltimore: Penguin Books, 1972.

MLA Citation

Pen, J. Modern Economics: .P456 1972. Baltimore: Penguin Books, 1972.

Warning: These citations may not always be 100% accurate.