Duffy, B. K., & Besel, R. D. (2016). Green Voices: Defending Nature and the Environment in American Civic Discourse. State University of New York Press.
Lua i Stíl Chicago (17ú heag.)Duffy, Bernard K., agus Richard D. Besel. Green Voices: Defending Nature and the Environment in American Civic Discourse. Albany, NY: State University of New York Press, 2016.
Lua MLA (9ú heag.)Duffy, Bernard K., agus Richard D. Besel. Green Voices: Defending Nature and the Environment in American Civic Discourse. State University of New York Press, 2016.
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