APA-ийн эшлэл(7 дахь хэвлэлт)

Duffy, B. K., & Besel, R. D. (2016). Green Voices: Defending Nature and the Environment in American Civic Discourse. State University of New York Press.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Duffy, Bernard K., ба Richard D. Besel. Green Voices: Defending Nature and the Environment in American Civic Discourse. Albany, NY: State University of New York Press, 2016.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Duffy, Bernard K., ба Richard D. Besel. Green Voices: Defending Nature and the Environment in American Civic Discourse. State University of New York Press, 2016.