Cita APA (7a ed.)
Christofferson, B. (2004). The man from Clear Lake: Earth Day founder Gaylord Nelson. University of Wisconsin Press.
Cita Chicago Style (17a ed.)
Christofferson, Bill. The Man from Clear Lake: Earth Day Founder Gaylord Nelson. Madison, Wis.: University of Wisconsin Press, 2004.
Cita MLA (9a ed.)
Christofferson, Bill. The Man from Clear Lake: Earth Day Founder Gaylord Nelson. University of Wisconsin Press, 2004.
Precaución: Estas citas no son 100% exactas.