1997 IUCN red list of threatened plants (1997)

e la han zhong zhi zhi wu ming chen (shi yong ben ) - Zhongguo ke xue yuan. Bian yi chu ban wei yuan hui. (ke xue chu ban she)

An environmental profile of the Black Sea Coast - Gillett, Harriet J. (WCMC, 1997)

Flora of the U.S.S.R - Botanicheskiĭ institut (Akademii︠a︡ nauk SSSR) (Israel Program for Scientific Translations, 1968)

List of rare, threatened and endemic plants in Europe (1982 edition) (1983)

Preliminary draft list of plant species for inclusion in a 'Responsibility List' of European plants - WCMC (WCMC, 1989)