Cita APA (7th ed.)
Arnold, R. A. (2001). Economics (6th ed.). South-Western College Pub..
Cita Chicago (17th ed.)
Arnold, Roger A. Economics. 6th ed. Cincinnati, Ohio: South-Western College Pub., 2001.
Cita MLA (9th ed.)
Arnold, Roger A. Economics. 6th ed. South-Western College Pub., 2001.
Atenció: Aquestes cites poden no estar 100% correctes.