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Castro, P., and M.E. Huber. 2005. Marine Biology. 5th edition. McGraw-Hill, New York. N.Y.

Meglitsch, P.A., and F.R. Schram. 1991. Invertebrate Zoology. Third edition. Oxford University press, New York., Oxford. 623 pp.

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Pechenik, J.A. 2005. Biology of the Invertebrates. Fifth edition. McGraw Hill, 590 pp.

Ruppert, E.E., R.S. Fox, and R.D. Barnes. 2004. Invertebrate Zoology, A Functional Evolutionary Approach. Seventh edition. Brooks/Cole, 961 pp.