Salihu, H; Shumpert, MN; Slay, M; Kirby, RS; Alexander, GR (November 2003). "Childbearing beyond maternal age 50 and fetal outcomes in the United States". Obstetrics & Gynecology. 102 (5): 1006–1014. doi:10.1016/s0029-7844(03)00739-7. PMID14672478. S2CID20499725.
"51-летняя киевлянка родила двойню" [51-year-old woman from Kiev gave birth to twins]. Korrespondent.net (in Russian). June 13, 2001. Archived from the original on March 3, 2016. Retrieved 3 May 2022.
Salihu, H; Shumpert, MN; Slay, M; Kirby, RS; Alexander, GR (November 2003). "Childbearing beyond maternal age 50 and fetal outcomes in the United States". Obstetrics & Gynecology. 102 (5): 1006–1014. doi:10.1016/s0029-7844(03)00739-7. PMID14672478. S2CID20499725.
Salihu, H; Shumpert, MN; Slay, M; Kirby, RS; Alexander, GR (November 2003). "Childbearing beyond maternal age 50 and fetal outcomes in the United States". Obstetrics & Gynecology. 102 (5): 1006–1014. doi:10.1016/s0029-7844(03)00739-7. PMID14672478. S2CID20499725.
"51-летняя киевлянка родила двойню" [51-year-old woman from Kiev gave birth to twins]. Korrespondent.net (in Russian). June 13, 2001. Archived from the original on March 3, 2016. Retrieved 3 May 2022.