Cita APA (7th ed.)
(2001). OECD statistics on international trade in services 1990-1999 (2001 edition.). OECD.
Cita Chicago (17th ed.)
OECD Statistics on International Trade in Services 1990-1999. 2001 edition. Paris, Cedex, France: OECD, 2001.
Cita MLA (9th ed.)
OECD Statistics on International Trade in Services 1990-1999. 2001 edition. OECD, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.