Cita APA (7th ed.)

Pen, J. (1971). Income distribution. Penguin Books.

Cita Chicago (17th ed.)

Pen, J. Income Distribution. Baltimore, Maryland: Penguin Books, 1971.

Cita MLA (8th ed.)

Pen, J. Income Distribution. Penguin Books, 1971.

Atenció: Aquestes cites poden no estar 100% correctes.