Hughes, D. (1996). Environmental law (ed. 3.). Butterworths.
Chicago Style aipamenaHughes, David. Environmental Law. ed. 3. London: Butterworths, 1996.
MLA aipamenaHughes, David. Environmental Law. ed. 3. Butterworths, 1996.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.