Christofferson, B. (2004). The man from Clear Lake: Earth Day founder Gaylord Nelson. University of Wisconsin Press.
芝加哥风格引文Christofferson, Bill. The Man from Clear Lake: Earth Day Founder Gaylord Nelson. Madison, Wis.: University of Wisconsin Press, 2004.
MLA引文Christofferson, Bill. The Man from Clear Lake: Earth Day Founder Gaylord Nelson. University of Wisconsin Press, 2004.
警告：这些引文格式不一定是100％准确.