- ↑ 1.0 1.1 Cutler, Edward B. (1994) , The Sipuncula: Their Systematics, Biology, and Evolution, xvii + 453
- ↑ 2.0 2.1 Cutler, Norma J., and Edward B. Cutler (1990) A revision of the subgenus Phascolosoma (Sipuncula: Phascolosoma), Proceedings of the Biological Society of Washington, vol. 103, no. 3, 691-730
- ↑ Rice, Mary E. (1985) Description of a wood dwelling sipunculan Phascolosoma turnerae, new species, Proceedings of the Biological Society of Washington, vol. 98, no. 1, 54-60
- ↑ 4.0 4.1 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