Brown, Phyllis. "Researchers define characteristics, treatment options for XXYY Syndrome ." University of California. Regents of the University of California, 2007. Web. November 6, 2009. Universityofcalifornia.eduArkiverad 1 april 2010 hämtat från the Wayback Machine.
Brown, Phyllis. "Researchers define characteristics, treatment options for XXYY Syndrome ." University of California. Regents of the University of California, 2007. Web. November 6, 2009. Universityofcalifornia.eduArkiverad 1 april 2010 hämtat från the Wayback Machine.