Cita APA (7th ed.)

Byrns, R. (1987). Economics (3rd ed.). Scott,Foresman.

Cita Chicago (17th ed.)

Byrns, Ralph. Economics. 3rd ed. Illinois: Scott,Foresman, 1987.

Cita MLA (9th ed.)

Byrns, Ralph. Economics. 3rd ed. Scott,Foresman, 1987.

Atenció: Aquestes cites poden no estar 100% correctes.