Clark, J., & Veseth, M. (1987). Economics: Cost and choice. Harcourt brace.
Lua i Stíl Chicago (17ú heag.)Clark, J.R, agus Michael Veseth. Economics: Cost and Choice. San Diego: Harcourt brace, 1987.
Lua MLA (9ú heag.)Clark, J.R, agus Michael Veseth. Economics: Cost and Choice. Harcourt brace, 1987.
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