The following bibliography has been generated by bringing together all references provided by our content partners. There may be duplication.

References

• 1. National Biodiversity Network Species Dictionary (Jan 2003) http://www.nhm.ac.uk/nbn/
• 2. Olsen, L., Sunesen, J., & Pedersen, B. V. (1999) Small freshwater creatures. Oxford University Press, Oxford.
• 3. Animal Diversity Web: Brown Hydra (March 2003) http://animaldiversity.ummz.umich.eduaccounts/hydra/h._oligactis.html
• 4. Nichols, D., Cooke, J. & Whiteley, D. (1971) The Oxford Book of Invertebrates. Oxford University Press, Oxford.
• Brusca, Richard C. and Gary J. Brusca. 1990. Invertebrates. Sinauer Associates, Inc., Sunderland.
• Cairns, Stephen D., Dale R. Calder, Anita Brinckmann-Voss, Clovis B. Castro, Daphne G. Fautin,.. 2002. Common and Scientific Names of Aquatic Invertebrates from the United States and Canada: Cnidaria and Ctenophora, Second Edition, 2002. American Fisheries Society Special Publication 28. xi + 115
• Hyman, Libbie Henrietta. 1940. The Invertebrates: Protozoa through Ctenophora. McGraw Hill Book Co., New York.
• Pearse, Vicki and John and Mildred and Ralph Buchsbaum. 1987. Living Invertebrates. Blackwell Scientific Publications, Palo Alto.
• Pennak, Robert W. 1989. Invertebrates of the United States: Protozoa to Mollusca. John Wiley and Sons, Inc., New York.