1. My garden in spring, by E. A. Bowles.
2. M.F. Fay, K. Borland, P. Stranc, and M.W Chase . (2001 ).Phylogenetics of the genusTulipa(Liliaceae): evidence from five plastid DNA regions. Botany 2001 Abstracts , Botanical Society of Americap. 112 . http://www.botany2001.org/botany2001b.pdf