E. A.  Smith, ?Description of a new species of Opisthostoma from North Borneo?, The annals and magazine of natural history, including zoology, botany and geology, vol. 7, p. 360, 1905.

E. A.  Smith, ?Description of a new species of Opisthostoma from North Borneo?, Proceedings of the Malacological Society of London, vol. 6, p. 105, 1905.