Cunningham, W. P., & Saigo, B. W. (1997). Environmental Science: A Global Concern. Boston: McGraw-Hill.
Chicago Style aipamenaCunningham, William P., và Barbara Woodworth Saigo. Environmental Science: A Global Concern. Boston: McGraw-Hill, 1997.
MLA aipamenaCunningham, William P., và Barbara Woodworth Saigo. Environmental Science: A Global Concern. Boston: McGraw-Hill, 1997.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.