Parkin, M., Powell, M., & Matthews, K. (2012). Economics (8th ed.). Addison-Wesley ; Pearson.
Lua i Stíl Chicago (17ú heag.)Parkin, Michael, Melanie Powell, agus Kent Matthews. Economics. 8th ed. Harlow, England ; Boston, MA: Addison-Wesley ; Pearson, 2012.
Lua MLA (8ú heag.)Parkin, Michael, et al. Economics. 8th ed. Addison-Wesley ; Pearson, 2012.
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