(WWF), W. W. F. 781: Archief van World Wildlife Fund (WWF).
Chicago Style aipamena(WWF), World Wildlife Fund. 781: Archief Van World Wildlife Fund (WWF).
MLA aipamena(WWF), World Wildlife Fund. 781: Archief Van World Wildlife Fund (WWF).
Kontuz: berrikusi erreferentzia hauek erabili aurretik.