E. B.  Cutler, The Sipuncula. Their systematics, biology and evolution. Ithaca, N.Y.: Cornell University Press, 1994, p. 453 pp.

E. B.  Cutler and Cutler, N. J., ?Madagascar and Indian Ocean Sipuncula?, Bulletin du Museum National d?Histoire Naturelle, Paris, vol. 4e, pp. 941-990, 1979.