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Klinefelter Syndrome, su Health Information, National Institute of Health and Human Development, 19 febbraio 2007. URL consultato il 24 marzo 2007. and Klinefelter syndrome, su Genetics Home Reference, National Library of Medicine, 2006. URL consultato il 24 marzo 2007 (archiviato dall'url originale il 23 marzo 2007). both provide statistical estimates.
Klinefelter Syndrome, su Health Information, National Institute of Health and Human Development, 19 febbraio 2007. URL consultato il 24 marzo 2007. and Klinefelter syndrome, su Genetics Home Reference, National Library of Medicine, 2006. URL consultato il 24 marzo 2007 (archiviato dall'url originale il 23 marzo 2007). both provide statistical estimates.