APA-ийн эшлэл(7 дахь хэвлэлт)

Christofferson, B. (2004). The man from Clear Lake: Earth Day founder Gaylord Nelson. University of Wisconsin Press.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Christofferson, Bill. The Man from Clear Lake: Earth Day Founder Gaylord Nelson. Madison, Wis.: University of Wisconsin Press, 2004.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Christofferson, Bill. The Man from Clear Lake: Earth Day Founder Gaylord Nelson. University of Wisconsin Press, 2004.