Randolph, Lowell Fritz; Mitra, Jyotirmay (November 1961). "Karyotypes of Iris Species Indigenous to the USSR". American Journal of Botany. 48 (10). Botanical Society of America: 862–870. doi:10.2307/2439526. JSTOR2439526.
encyclopedia.com
"Barbara McClintock". encyclopedia.com (Complete Dictionary of Scientific Biography, 2008). Retrieved 9 November 2015.
Randolph, Lowell Fritz; Mitra, Jyotirmay (November 1961). "Karyotypes of Iris Species Indigenous to the USSR". American Journal of Botany. 48 (10). Botanical Society of America: 862–870. doi:10.2307/2439526. JSTOR2439526.