- ↑ Cutler, Edward B. (1994) , The Sipuncula: Their Systematics, Biology, and Evolution, xvii + 453
- ↑ Cutler, Edward B., and Norma J. Cutler (1985) A revision of the genera Phascolion Théel, and Onchnesoma Koren and Danielssen (Sipuncula), Proceedings of the Biological Society of Washington, vol. 98, no. 4, 809-850
- ↑ 3.0 3.1 Bisby F.A., Roskov Y.R., Orrell T.M., Nicolson D., Paglinawan L.E., Bailly N., Kirk P.M., Bourgoin T., Baillargeon G., Ouvrard D. (ed.) (2011). "Species 2000 & ITIS Catalogue of Life: 2011 Annual Checklist". Species 2000: Reading, UK. Ginkuhà 24 Septyembre 2012.CS1 maint: multiple names: authors list (link) CS1 maint: extra text: authors list (link)
- ↑ ITIS: The Integrated Taxonomic Information System. Orrell T. (custodian), 26 Abril 2011