Цифровые книги ЗА и ПРОТИВ )

[Yevgeny]

J.C. Manning & P. Goldblatt. 2018. "Systematics of Drimia Jacq. (Hyacinthaceae: Urgineoideae) in southern Africa"

[Yevgeny]

Brian Fearn & Leslie Pearcy. 1981. "The genus Rebutia"
John Pilbeam. 1997. "Rebutia".

[Yevgeny]

Charles Scott (1913-2001). 1985. "The Genus Haworthia - A taxonomic revision"

[Yevgeny]

Steven Hammer. 1993. "The genus Conophytum"
Steven Hammer. 2002. "Dumpling and His Wife: New Views of the Genus Conophytum"