Hill, M. k. (2004). Understanding environmental pollution (2nd ed.). Cambridge.
Chicago Style aipamenaHill, Marquita k. Understanding Environmental Pollution. 2nd ed. New Delhi: Cambridge, 2004.
MLA aipamenaHill, Marquita k. Understanding Environmental Pollution. 2nd ed. Cambridge, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.