De Interactieve Duikgids, Nederland onder water gezien: Acorn-worms and Sea squirts (Phyla Hemichordata and Urochordata). In: Handbook of the Marine Fauna of North-West Europe. (ed. P.J. Hayward & J.S. Ryland). Oxford University Press, Oxford.

Literature

Auteur(s)	Knight-Jones, E.W. & J.S. Ryland
Jaar	1995
Titel	Acorn-worms and Sea squirts (Phyla Hemichordata and Urochordata). In: Handbook of the Marine Fauna of North-West Europe. (ed. P.J. Hayward & J.S. Ryland). Oxford University Press, Oxford.