United, N. (2004). World investment report 2004: The shift towards services.
Chicago Style aipamenaUnited, Nations. World Investment Report 2004: The Shift Towards Services. New York, United Nations, 2004.
MLA aipamenaUnited, Nations. World Investment Report 2004: The Shift Towards Services. 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.