Case Karle E. (2018). Principles Of Economics (12.). Pearson.
Lua i Stíl Chicago (17ú heag.)Case Karle E. Principles Of Economics. 12. Noida: Pearson, 2018.
Lua MLA (9ú heag.)Case Karle E. Principles Of Economics. 12. Pearson, 2018.
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