Sharp, A. M. (2008). Economics of social issues (18th ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Sharp, Ansel M. Economics of Social Issues. 18th ed. Boston: McGraw-Hill, 2008.
Lua MLA (9ú heag.)Sharp, Ansel M. Economics of Social Issues. 18th ed. McGraw-Hill, 2008.
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