1. D. J. Mabberley, The Plant Book, London, U. K., 1997, 858 pp.
2. Flora of the USSR [in Russian], Vol. 14, Izd. Akad. Nauk SSSR, Moscow, Leningrad, 1949, p. 1.
3. Guide to Plants of Central Asia [in Russian], Vol. 7, Izd. Akad. Nauk UzSSR, Tashkent, 1983, p. 6.
4. Flora of Uzbekistan [in Russian], Vol. 4, Izd. Akad. Nauk UzSSR, Tashkent, 1959, p. 23.
5. K. Sh. Tozhibaev, Flora of Southwestern Tian-Shan [in Russian], Izd. Akad. Nauk Resp. Uz., Tashkent, 2010, 100 pp.