1. BISHOP, M.J., and S.J. HEWITT, 1976. Assemblages ofPisidium species (Bivalvia, Sphaeriidae) from localities in eastern England. Freshwater Biol., 6:177–182.
2. CODY, M.L., 1977. Towards a theory of continental species diversities. Ecology and Evolution (eds. M.L. Cody and J.M. Diamond), Cambridge-Massachusetts-London, second printing: 214–258.
3. CONNELL, J.H., 1977. Some mechanisms producing structure in natural communities. Ecology and Evolution (eds. M.L. Cody and J.M. Diamond), Cambridge-Massachusetts-London, second printing: 460–492.
4. DANNEEL, J., and W. HINZ, 1976. Zur Biologie vonPisidium amnicum O.F. Müller (Bivalvia). Arch. Hydrobiol., 77:213–225.
5. DIAMOND, J.M., 1977. Assembly of species communities. Ecology and Evolution (eds. M.L. Cody and J.M. Diamond), Cambridge-Massachusetts-London, second printing:342–445.