(1992). The world environment 1972-1992: Two decades of challenge. London: Chapman and Hall.
Chicago Style aipamenaThe World Environment 1972-1992: Two Decades of Challenge. London: Chapman and Hall, 1992.
MLA aipamenaThe World Environment 1972-1992: Two Decades of Challenge. London: Chapman and Hall, 1992.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.