APA aipamena

World Trade Organization. (1995). Second protocol to the general agreement on trade in services. WTO.

Chicago Style aipamena

World Trade Organization. Second Protocol to the General Agreement on Trade in Services. Geneva: WTO, 1995.

MLA aipamena

World Trade Organization. Second Protocol to the General Agreement on Trade in Services. WTO, 1995.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.