W. S. S.  van Benthem-Jutting, ?The Malayan species of Opisthostoma (Gastropoda, Probranchia, Cyclophoridae), with a catalogue of all the species hitherto described?, The Bulletin of the Raffles Museum, vol. 24, pp. 5-61, 1952.

T.  Habe, ?Operculated land molluscs from Southeast Asia?, Nature and life in Southeast Asia, vol. 4, pp. 111-128, 1965.