CRUZ W. (2001). PROTECTING THE GLOBAL ENVIRONMENT. WORLD BANK.
Chicago Style aipamenaCRUZ W. PROTECTING THE GLOBAL ENVIRONMENT. WASHINGTON: WORLD BANK, 2001.
MLA aipamenaCRUZ W. PROTECTING THE GLOBAL ENVIRONMENT. WORLD BANK, 2001.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.