@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.}
}
