Dyfyniad APA

(1999). Purchasing power parities and real expenditures (1999 edition.). OECD.

Dyfyniad Arddull Chicago

Purchasing Power Parities and Real Expenditures. 1999 edition. Paris, Cedex, France: OECD, 1999.

Dyfyniad MLA

Purchasing Power Parities and Real Expenditures. 1999 edition. OECD, 1999.

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