APA Style

Porter, Gareth., Brown, Janet Welsh.. (c1991). Global Environmental Politics . Boulder: Westview Press.

Chicago Style

Porter, Gareth., Brown, Janet Welsh.. Global Environmental Politics. Boulder: Westview Press, c1991. Text.

MLA Style

Porter, Gareth., Brown, Janet Welsh.. Global Environmental Politics. Boulder: Westview Press, c1991. Text.

Turabian Style

Porter, Gareth., Brown, Janet Welsh.. Global Environmental Politics. Boulder: Westview Press, c1991. Print.