Dyfyniad APA

(1997). EconLit: 1969 - September 1997. Newton Lower Falls, Mass: SilverPlatter Information Services.

Dyfyniad Arddull Chicago

EconLit: 1969 - September 1997. Newton Lower Falls, Mass: SilverPlatter Information Services, 1997.

Dyfyniad MLA

EconLit: 1969 - September 1997. Newton Lower Falls, Mass: SilverPlatter Information Services, 1997.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.