H. H.  Godwin-Austen, ?On a Collection of Land-Shells made in Borneo by Mr. A. Everett, with Descriptions of supposed new species. Part I.?, Proceedings of the scientific meetings of the Zoological Society of London, pp. 332-355, 1889.

E. A.  Smith, ?On a collection of land-shells from Sarawak, British North Borneo, Palawan, and other neighbouring islands?, Proceedings of the Zoological Society of London, vol. 1895, pp. 97?127, 1895.

E. A.  Smith, ?On the land-shells of the Natuna Islands?, The annals and magazine of natural history, including zoology, botany and geology, vol. 6, pp. 453-463, 1894.

E.  von Martens, ?Beschreibung einiger im östlichen Borneo von Dr. Martin Schmidt gesammelten Land und Süßwasser-Conchylien.?, Mitteilungen aus dem Zoologischen Museum, vol. 4, pp. 251-291, 1908.

A. J.  Wagner, ?Helicinenstudien. Monographie der genera Palaeohelicina A.J.Wagner und Helicina Lamarck?, Denkschriften der Kaiserlichen Akademie der Wissenschaften, vol. 77, pp. 357-450, 1905.

F. G.  Thompson and Dance, S. P., ?Non-marine mollusks of Borneo II Pulmonata Pupi, III Prosobranchia Hydrocenidae, Helicinidae?, Bulletin of the Florida State Museum. Biological sciences, vol. 29, pp. 102-152, 1983.