APA (7th ed.) Zitazioa

Water & Waste Utilities of the World. ABS Energy Research.

Chicago Style (17th ed.) Zitazioa

Water & Waste Utilities of the World. ABS Energy Research.

MLA (9th ed.) Zitazioa

Water & Waste Utilities of the World. ABS Energy Research.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.