- Characteristics of Genus Echeveria
- Dick Wright and his echeverias by Ruth Wright
- Dick Wright's hybrids - an updated list May 2013
- Echeveria hybrids by H.M.Butterfield
- Echeveria list in La Belgique Horticole 1874
- Echeveria list in La Belgique Horticole 1875
- H.M.Butterfield : Some hybrids and cultivars of C.B.Wright with parentage and date of origin.
- Les hybrides de Jean-Baptiste A. Deleuil
- Pierre Gossot's hybrids
- Renee O'Connell's hybrids
Echeveria