Cita APA (7th ed.)
Clayton, G. E. (2001). Economics: Principles and Practices. mcGraw-Hill.
Cita Chicago (17th ed.)
Clayton, Gray E. Economics: Principles and Practices. New york: mcGraw-Hill, 2001.
Cita MLA (9th ed.)
Clayton, Gray E. Economics: Principles and Practices. mcGraw-Hill, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.