Parkin, M. (2014). Economics (11th ed.). Pearson.
Cita Chicago (17th ed.)Parkin, Michael. Economics. 11th ed. Boston: Pearson, 2014.
Cita MLA (8th ed.)Parkin, Michael. Economics. 11th ed. Pearson, 2014.
Atenció: Aquestes cites poden no estar 100% correctes.