Gilgenkrantz, Simone (October 15, 2008). "Nettie Maria Stevens (1861–1912)" (in French). Clérey-sur-Brénon, France: Médecine/Sciences. Archived from the original on August 17, 2013. Retrieved August 18, 2013.{{cite web}}: CS1 maint: unrecognized language (link)
Gilgenkrantz, Simone (October 15, 2008). "Nettie Maria Stevens (1861–1912)" (in French). Clérey-sur-Brénon, France: Médecine/Sciences. Archived from the original on August 17, 2013. Retrieved August 18, 2013.{{cite web}}: CS1 maint: unrecognized language (link)