SAMUELSON, P. A., & DONORHAUS, W. D. (1985). Economics.-- ed.12. McGraw-hill.
Lua i Stíl Chicago (17ú heag.)SAMUELSON, Paul A., agus William D. DONORHAUS. Economics.-- Ed.12. New York: McGraw-hill, 1985.
Lua MLA (9ú heag.)SAMUELSON, Paul A., agus William D. DONORHAUS. Economics.-- Ed.12. McGraw-hill, 1985.
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