@inbook {638,
	title = {Classe des sipunculiens},
	booktitle = {Traite de Zoologie. Anatomie, Systematique, Biologie},
	year = {1959},
	publisher = {Masson et Editeurs},
	organization = {Masson et Editeurs},
	address = {Paris},
	author = {Tetry, A.},
	editor = {Grasse, P. P.}
}
