Swalla, B.J.; van der Land, J. (2024). Hemichordata World Database. Spengelidae Willey, 1899. Accessed through: Glover, A.G.; Higgs, N.; Horton, T. (2024) World Register of Deep-Sea species (WoRDSS) at: https://marinespecies.org/DeepSea/aphia.php?p=taxdetails&id=23150 on 2024-03-28
Glover, A.G.; Higgs, N.; Horton, T. (2024). World Register of Deep-Sea species (WoRDSS). Spengelidae Willey, 1899. Accessed at: https://marinespecies.org/deepsea/aphia.php?p=taxdetails&id=23150 on 2024-03-28