Smith, KL; Hollnad,ND; Ruhl, HA (2005년 7월). “Enteropneust production of spiral fecal trails on the deep-sea floor observed with time-lapse photography”. Bibcode:2005DSRI...52.1228S. doi:10.1016/j.dsr.2005.02.004.|url=이 없거나 비었음 (도움말)
Holland, ND; Clague, DA; Gordon, DP; Gebruk, A; Pawson, DL; Vecchione, M (2005). “'Lophenteropneust' hypothesis refuted by collection and photos of new deep-sea hemichordates”. Bibcode:2005Natur.434..374H. doi:10.1038/nature03382. PMID15772659.|url=이 없거나 비었음 (도움말)
Smith, KL; Hollnad,ND; Ruhl, HA (2005년 7월). “Enteropneust production of spiral fecal trails on the deep-sea floor observed with time-lapse photography”. Bibcode:2005DSRI...52.1228S. doi:10.1016/j.dsr.2005.02.004.|url=이 없거나 비었음 (도움말)
Holland, ND; Clague, DA; Gordon, DP; Gebruk, A; Pawson, DL; Vecchione, M (2005). “'Lophenteropneust' hypothesis refuted by collection and photos of new deep-sea hemichordates”. Bibcode:2005Natur.434..374H. doi:10.1038/nature03382. PMID15772659.|url=이 없거나 비었음 (도움말)
marinespecies.org
Konikoff, C; van der Land, J (2013). “Enteropneusta”. World Register of Marine Species. 2017년 11월 20일에 확인함.
Holland, ND; Clague, DA; Gordon, DP; Gebruk, A; Pawson, DL; Vecchione, M (2005). “'Lophenteropneust' hypothesis refuted by collection and photos of new deep-sea hemichordates”. Bibcode:2005Natur.434..374H. doi:10.1038/nature03382. PMID15772659.|url=이 없거나 비었음 (도움말)