H. H.  Godwin-Austen, ?On a Collection of Land-Shells made in Borneo by Mr. A. Everett, with Descriptions of supposed new Species. Part II. Zonitidae and Helicidae.?, Proceedings of the Zoological Society of London, pp. 22-47, 1891.

E. A.  Smith, ?Descriptions of new species of land-shells from Borneo?, Journal of the Proceedings of the Linnean Society. Zoology, vol. 24, pp. 341-352, 1894.