APA

Porter G., Brown J. W., . (1996). Global environmental politics. Colorado: Westview Press.

Chicago

Porter Gareth, Brown Janet Welsh, . 1996. Global environmental politics. Colorado: Westview Press.

Harvard

Porter G., Brown J. W., . (1996). Global environmental politics. Colorado: Westview Press.

MLA

Porter Gareth, Brown Janet Welsh, . Global environmental politics. Colorado: Westview Press. 1996.