^IUCN 2009. IUCN Red List of Threatened Species. Version 2009.2. <www.iucnredlist.org>. Downloaded on 7 November 2009.
^ abcdefghijklmnoBrook F. J. (2010). "Coastal landsnail fauna of Rarotonga, Cook Islands: systematics, diversity, biogeography, faunal history, and environmental influences". Tuhinga: records of the Museum of New Zealand Te Papa Tongarewa21: 161-252. abstract.
^Solem A. (7 January 1983) Endodontoid land snails from Pacific Islands (Mollusca: Pulmonata: Sigmurethra). Part II. Families Punctidae and Charopidae, Zoogeography. Field Museum of Natural History, Chicago, ISSN 0015-0754. [1]