@article {636,
	title = {Sipunculoidea und Echiuroidea},
	journal = {Tierwelt Deutschlands und der Angrenzenden},
	volume = {15},
	year = {1929},
	pages = {156-168},
	author = {tenBroeke, A.}
}
@inbook {270,
	title = {Die Sipunculiden, Priapuliden und Echiuriden der Arktis},
	booktitle = {Fauna Arctica},
	year = {1929},
	pages = {451-490},
	author = {Fischer, W.},
	editor = {Romer, F. and Schaudinn, F.}
}
@article {664,
	title = {Some anatomical features subject to variation in <i>Phascolion strombi</i>},
	journal = {Videnskabelige Meddelelser Danske fra Naturhistorisk Forening i Kjobenhaven},
	volume = {88},
	year = {1929},
	pages = {155-164},
	author = {Wesenberg-Lund, E.}
}
