Crassula tillaea Lester-Garland
| XLI.—A Catalogue of Sicilian Plants; with some remarks on the Geography, Geology, and Vegetation of Sicily John Hogg (1842) Annals And Magazine of Natural History 10: 287-335 | |
| The genera of Crassulaceae in the southeastern United States S A Spongberg (1978) Journal of the Arnold Arboretum 59: 197-248 |