Morris, JK; Mutton, DE; Alberman, E (2002). “Revised estimates of the maternal age specific live birth prevalence of Down's syndrome”. 《Journal of Medical Screening》 9 (1): 2–6. doi:10.1136/jms.9.1.2. PMID11943789.
Malt, EA; Dahl, RC; Haugsand, TM; Ulvestad, IH; Emilsen, NM; Hansen, B; Cardenas, YE; Skøld, RO; Thorsen, AT; Davidsen, EM (2013년 2월 5일). “Health and disease in adults with Down syndrome”. 《Tidsskrift for den Norske Laegeforening : Tidsskrift for Praktisk Medicin, NY Raekke》 133 (3): 290–94. doi:10.4045/tidsskr.12.0390. PMID23381164.
Morris, JK; Mutton, DE; Alberman, E (2002). “Revised estimates of the maternal age specific live birth prevalence of Down's syndrome”. 《Journal of Medical Screening》 9 (1): 2–6. doi:10.1136/jms.9.1.2. PMID11943789.
Malt, EA; Dahl, RC; Haugsand, TM; Ulvestad, IH; Emilsen, NM; Hansen, B; Cardenas, YE; Skøld, RO; Thorsen, AT; Davidsen, EM (2013년 2월 5일). “Health and disease in adults with Down syndrome”. 《Tidsskrift for den Norske Laegeforening : Tidsskrift for Praktisk Medicin, NY Raekke》 133 (3): 290–94. doi:10.4045/tidsskr.12.0390. PMID23381164.