Dyfyniad APA

(1982). Economics (2nd. ed.). McGraw-Hill book company.

Dyfyniad Arddull Chicago

Economics. 2nd. ed. Japan: McGraw-Hill book company, 1982.

Dyfyniad MLA

Economics. 2nd. ed. McGraw-Hill book company, 1982.

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