Case, K. E. (2003). Principles of economicsKarl E. Case, Ray C. Fair. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Case, Karl E. Principles of EconomicsKarl E. Case, Ray C. Fair. Prentice Hall, 2003.
Lua MLA (8ú heag.)Case, Karl E. Principles of EconomicsKarl E. Case, Ray C. Fair. Prentice Hall, 2003.
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