RUFFIN, R. J. (1983). Principles Of Macroeconomics Roy J. Ruffin And Paul R. Gregory. Scott Foresman & Co.
Lua i Stíl Chicago (17ú heag.)RUFFIN, Roy J. Principles Of Macroeconomics Roy J. Ruffin And Paul R. Gregory. Scott Foresman & Co, 1983.
Lua MLA (8ú heag.)RUFFIN, Roy J. Principles Of Macroeconomics Roy J. Ruffin And Paul R. Gregory. Scott Foresman & Co, 1983.
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