(1999). Purchasing power parities and real expenditures (1999 edition.). OECD.
芝加哥风格引文Purchasing Power Parities and Real Expenditures. 1999 edition. Paris, Cedex, France: OECD, 1999.
MLA引文Purchasing Power Parities and Real Expenditures. 1999 edition. OECD, 1999.
警告：这些引文格式不一定是100％准确.