1Irish, Gary. Agaves, Yuccas, and Related Plants:a Gardener' s Guide[M]. Timber Press, 2000.
2William Trelease. The Yucceae[J].Annual Report of the Missouri BotaMcal Garden, 1902, (13) :27-68.
3McKelvey, S.D. Yuccas of the Southwestern United States, Vols. 1,2[M].Arnold Arboretum, Jamaica Plain, 1938, 1947.
4Fritz Hochst/Itter, etc. Dehiscent-fruited species in the Southwest and Midwest of the USA, Canada and Baja California. Yucca (Agavaceae) I[M]. Selbst Verlag. I, 2000.
5Fritz HochstAtter, etc. Indehiscent-fruited species in the Southwest, Midwest and East of the USA. Yucca (Agavaceae)2[M].Selbst Yerlag.,2002.
6Fritz HochstAtter, etc. Mexico. Yucca (Agavaceae)3[M]. Selbst Verlag.,2004.
