Fraser, Jean H.; Campbell, John; MacGillivray, Ronald Charles; Boyd, Elizabeth; Lennox, Bernard (September 17, 1960). "The XXX syndrome: frequency among mental defectives and fertility". The Lancet. 276 (7151): 626–627. doi:10.1016/S0140-6736(60)91696-2. PMID13701513.
Jacobs, Patricia A.; Baikie, Albert G.; Court Brown, W. Michael; MacGregor, Thomas N.; Maclean, Neil; Harnden, David G. (September 26, 1959). "Evidence for the existence of the human 'super female'". The Lancet. 274 (7100): 423–425. doi:10.1016/S0140-6736(59)90415-5. PMID14406377.
Fraser, Jean H.; Campbell, John; MacGillivray, Ronald Charles; Boyd, Elizabeth; Lennox, Bernard (September 17, 1960). "The XXX syndrome: frequency among mental defectives and fertility". The Lancet. 276 (7151): 626–627. doi:10.1016/S0140-6736(60)91696-2. PMID13701513.
Jacobs, Patricia A.; Baikie, Albert G.; Court Brown, W. Michael; MacGregor, Thomas N.; Maclean, Neil; Harnden, David G. (September 26, 1959). "Evidence for the existence of the human 'super female'". The Lancet. 274 (7100): 423–425. doi:10.1016/S0140-6736(59)90415-5. PMID14406377.
Fraser, Jean H.; Campbell, John; MacGillivray, Ronald Charles; Boyd, Elizabeth; Lennox, Bernard (September 17, 1960). "The XXX syndrome: frequency among mental defectives and fertility". The Lancet. 276 (7151): 626–627. doi:10.1016/S0140-6736(60)91696-2. PMID13701513.
Schrander-Stumpel C (2005). "Triple-X-Syndrome or Trisomy X". Patient Care. 32 (6): 15–21. Archived from the original(PDF) on 2011-07-24. Retrieved 2010-07-28. English translation from original Dutch by Jill Balfour.
Schrander-Stumpel C (2005). "Triple-X-Syndrome or Trisomy X". Patient Care. 32 (6): 15–21. Archived from the original(PDF) on 2011-07-24. Retrieved 2010-07-28. English translation from original Dutch by Jill Balfour.