Parkin, M. (1990). Economics. Addison-Wesley.
Cita Chicago (17th ed.)Parkin, Michael. Economics. Readings, Mass: Addison-Wesley, 1990.
Cita MLA (9th ed.)Parkin, Michael. Economics. Addison-Wesley, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.