Nielsen, K. E., & Kaye, H. J. (2004). The radical lives of Helen Keller. New York University Press.
Chicago Style (17th ed.) ZitazioaNielsen, Kim E., eta Harvey J. Kaye. The Radical Lives of Helen Keller. New York: New York University Press, 2004.
MLA (9th ed.) ZitazioaNielsen, Kim E., eta Harvey J. Kaye. The Radical Lives of Helen Keller. New York University Press, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.