A. J.  Berry, ?The habitats of some minute cyclophorids, hydrocenids and vertiginids on a Malayan limestone hill?, The Bulletin of the National Museum, vol. 30, pp. 101-105, 1961.

W. S. S.  van Benthem-Jutting, ?Additional new species and new localities of the family Vertiginidae and the genera Oophana and Opisthostoma from Malaya?, The Bulletin of the Raffles Museum, vol. 26, pp. 34-48, 1961.