Cita APA (7th ed.)
Bingham, R. C., & Walstad, W. B. (1990). Economic concepts: A programmed approach (9th ed.). McGraw-Hill, Inc..
Cita Chicago (17th ed.)
Bingham, Robert C., i William B. Walstad. Economic Concepts: A Programmed Approach. 9th ed. New York: McGraw-Hill, Inc., 1990.
Cita MLA (9th ed.)
Bingham, Robert C., i William B. Walstad. Economic Concepts: A Programmed Approach. 9th ed. McGraw-Hill, Inc., 1990.
Atenció: Aquestes cites poden no estar 100% correctes.