1. Baker H. B. 1955 Heterurethrous and Aulacopod. Nautilus 58 109^112.
2. Puerto Rican pupillids and clausilioids;Baker H. B.;Nautilus,1961
3. Gastropods from brackish and fresh water of the Jurassic^Cretaceous transition (a systematic evaluation);Bandel K.;Berliner Geowiss. Abh. A,1991
4. Higher classi¢cation and pattern of evolution of the Gastropoda;Bandel K.;Cour. Forsch.-Inst. Senkenberg,1997
5. Burch J. B. & Patterson C. M. 1969 The systematic position of the Athoracophoridae (Gastropoda: Euthyneura). Malacologia 9 259^260.