Gaya APA

Parkin, Michael. (1997). Economics (Ed. 4.). USA: Addinson-Wesley Publishing Company, Inc.

Gaya Chicago

Parkin, Michael. Economics. Ed. 4. USA: Addinson-Wesley Publishing Company, Inc, 1997. .

Gaya MLA

Parkin, Michael. Economics. Ed. 4. USA: Addinson-Wesley Publishing Company, Inc, 1997. .

Gaya Turabian

Parkin, Michael. Economics. Ed. 4. USA: Addinson-Wesley Publishing Company, Inc, 1997. .