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Nielsen, C. (2011-12-08). Phylum Xenoturbellida. In Animal Evolution: Interrelationships of the Living Phyla. : Oxford University Press. Retrieved 15 Dec. 2019, from https://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199606023.001.0001/acprof-9780199606023-chapter-20.

Nielsen, Claus. "Phylum Xenoturbellida." Animal Evolution: Interrelationships of the Living Phyla. : Oxford University Press,  December 17, 2013. Oxford Scholarship Online. Date Accessed 15 Dec. 2019 <https://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199606023.001.0001/acprof-9780199606023-chapter-20>.

Nielsen, Claus. "Phylum Xenoturbellida." In Animal Evolution: Interrelationships of the Living Phyla. 3rd ed. Oxford: Oxford University Press, 2011. Oxford Scholarship Online, 2013. doi: 10.1093/acprof:oso/9780199606023.003.0020.

Nielsen C. Phylum Xenoturbellida. In: Animal Evolution: Interrelationships of the Living Phyla. 3rd edition ed. Oxford University Press; 2011. https://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199606023.001.0001/acprof-9780199606023-chapter-20. Accessed December 15, 2019.