J. E. V.  Boas, Contributions to Pteropodernes, 1st ed., vol. 4. Spolia Atlantica-Vidensk, 1886, pp. 1-231.

S.  Van Der Spoel, Pseudothecosomata, gymnosomata and heteropoda (gastropoda). Amsterdam: Bohn, Scheltema & Holkeme Utrecht, 1976, p. 484.