Cita APA (7th ed.)
Spencer, M. H., & Amos, O. M. (1993). Contemporary economics (8th ed.). Worth Publishers.
Cita Chicago (17th ed.)
Spencer, Miltone H., i Orley M. Amos. Contemporary Economics. 8th ed. New York: Worth Publishers, 1993.
Cita MLA (9th ed.)
Spencer, Miltone H., i Orley M. Amos. Contemporary Economics. 8th ed. Worth Publishers, 1993.
Atenció: Aquestes cites poden no estar 100% correctes.