| O CANTO DAS CONCHAS / Helix alfredi Ilustração cientifica do sec. XIX - Desenho de Forde e litografia de G.B. Sowerby triplov.com 10-06-2003 |
| COX, James C. (1871) - Descriptions of new species of land and marine Shells from Australia and the South-Western Pacific. Proceedings of the Zoological Society of London, II: 323-325. Plate XXXIV. |