Peterson, W. L. (1983). Principles of economics: Macro. R.D. Irwin.
Lua i Stíl Chicago (17ú heag.)Peterson, Willis L. Principles of Economics: Macro. Homewood, Ill: R.D. Irwin, 1983.
Lua MLA (9ú heag.)Peterson, Willis L. Principles of Economics: Macro. R.D. Irwin, 1983.
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