APA (7th ed.) Zitazioa

National Planning Institute. (2007). The virtual water concept. National Planning Institute.

Chicago Style (17th ed.) Zitazioa

National Planning Institute. The Virtual Water Concept. cairo.: National Planning Institute, 2007.

MLA (9th ed.) Zitazioa

National Planning Institute. The Virtual Water Concept. National Planning Institute, 2007.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.