@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 {669,
	title = {Gephyrea},
	journal = {Bulletin Musee royal d{\textquoteright}Histoire naturelle de Belgique},
	volume = {13},
	number = {36},
	year = {1937},
	pages = {1-23},
	author = {Wesenberg-Lund, E.}
}
@article {671,
	title = {Gephyrea},
	journal = {Zoology of Iceland},
	volume = {2},
	number = {23},
	year = {1937},
	pages = {1-16},
	author = {Wesenberg-Lund, E.}
}
@article {142,
	title = {Gephyrea},
	journal = {Report of the Canadian Arctic Expedition 1913-18},
	volume = {9},
	number = {D},
	year = {1920},
	pages = {3-7},
	author = {Chamberlin, R. V.}
}
@article {600,
	title = {Gephyrea of the coasts of Ireland},
	journal = {Scientific Investigations of the Fisheries Branch, Department of Agriculture for Ireland},
	volume = {3},
	year = {1913},
	pages = {1-46},
	author = {Southern, R.}
}
