Millard, V. (2003). Classification of Mollusca: a classification of world wide Mollusca, volume 3. Calyptoptomatida: Aplacophora: Cephalopoda: Cricoonardiida: Monoplacophora: Polypolacophora: Scaphopoda. 3 rd Edition. Victor Millard: South Africa. ISBN 0-620-30452-9. 1281-1918 pp.
