@book {174,
	title = {The Sipuncula. Their systematics, biology and evolution},
	year = {1994},
	pages = {453 pp},
	publisher = {Cornell University Press},
	organization = {Cornell University Press},
	address = {Ithaca, N.Y.},
	author = {Cutler, E. B.}
}
@book {625,
	title = {The phyla Sipuncula and Echiura},
	year = {1972},
	pages = {528 pp},
	publisher = {Trustees British Mus. (Nat. Hist.)},
	organization = {Trustees British Mus. (Nat. Hist.)},
	address = {London},
	author = {Stephen, A. C. and Edmonds, S. J.}
}
@article {536,
	title = {The type specimens of Sipuncula and Echiura described by J.E. Gray and W. Baird in the collections of the British Museum of Natural History},
	journal = {Bulletin of the British Museum of Natural History},
	volume = {20},
	number = {2},
	year = {1970},
	pages = {49-72},
	author = {Rice, M. E. and Stephen, A. C.}
}
@article {125,
	title = {Monograph on the species of worms belonging to the subclass Gephyreae},
	journal = {Proceedings of the Zoological Society of London},
	volume = {1868},
	year = {1868},
	pages = {77-114},
	author = {Baird, W. B.}
}
