APA (7th ed.) Zitazioa

(2005). enviromental standards and competitiveness of key economic sectors. united nations.

Chicago Style (17th ed.) Zitazioa

Enviromental Standards and Competitiveness of Key Economic Sectors. new york: united nations, 2005.

MLA (9th ed.) Zitazioa

Enviromental Standards and Competitiveness of Key Economic Sectors. united nations, 2005.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.