1. Mémoire sur l’embryologie der Nemertes;Barrois;Ann. Sci. Nat. Ser. 6 Zool.,1877
2. Borradaile, L.A., Potts, F.A., with chapters by Eastham, L.E., Saunders, J.T., 1977. The Invertebrata, fourth ed. Revised by Kerkut, G.A.Cambridge University Press.
3. On the embryology of Nemertes;Desor;Proc. Boston J. Nat. Hist. Soc.,1848
4. Nemertini;Friedrich,1979
5. Section V Bilateral animal phyla, protostome coelomates;Henry,1997