Dyfyniad APA

Harrison,Barry, & Smith,Charles. (1992). Introductory economics. Mac Millan Press.

Dyfyniad Arddull Chicago

Harrison,Barry, and Smith,Charles. Introductory Economics. London: Mac Millan Press, 1992.

Dyfyniad MLA

Harrison,Barry, and Smith,Charles. Introductory Economics. Mac Millan Press, 1992.

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