Cita APA (7th ed.)
Walton, G. M., & Wykoff, F. C. (1991). Understanding economics today (3rd ed.). IRWIN.
Cita Chicago (17th ed.)
Walton, Gary M., i Frank C. Wykoff. Understanding Economics Today. 3rd ed. Illinois: IRWIN, 1991.
Cita MLA (9th ed.)
Walton, Gary M., i Frank C. Wykoff. Understanding Economics Today. 3rd ed. IRWIN, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.