BioStor
 | XLVII.—Descriptions of new species of Helix and Pupa from the colony of the Cape of Good Hope W H Benson (1864) Annals And Magazine of Natural History 13: 491-497 |
 | A revised reference list of South African Non-marine Mollusca; with descriptions of new species in the South African Museum M Connolly (1912) Cape Town Annals S African Museum 11: 59-306 |