(1991). Selected multilateral treaties in the field of the environment: ( Volume 2 ). UNEP.
Chicago Style aipamenaSelected Multilateral Treaties in the Field of the Environment: ( Volume 2 ). Nairobi: UNEP, 1991.
MLA aipamenaSelected Multilateral Treaties in the Field of the Environment: ( Volume 2 ). UNEP, 1991.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.