Cita APA (7th ed.)
Sharp, A. M. (2008). Economics of social issues (18th ed.). McGraw-Hill.
Cita Chicago (17th ed.)
Sharp, Ansel M. Economics of Social Issues. 18th ed. Boston: McGraw-Hill, 2008.
Cita MLA (9th ed.)
Sharp, Ansel M. Economics of Social Issues. 18th ed. McGraw-Hill, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.