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Dyfyniad Arddull ChicagoROMER DAVID. ADVANCED MACROECONOMICS. 2ND. BOSTON: MCGRAW-HILL, 2001.
Dyfyniad MLAROMER DAVID. ADVANCED MACROECONOMICS. 2ND. MCGRAW-HILL, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.