1. Brinkhurst, R. O., 1982. Evolution in the Annelida. Can. J. Zool. 60: 1043?1059.
2. Brinkhurst, R. O., 1984. Comments on the evolution of the Annelida. Hydrobiologia 109: 189?191.
3. Brinkhurst, R. O. & B. G. M. Jamieson, 1971. Aquatic Oligochaeta of the world. Oliver & Boyd, Edinb., 860 pp.
4. Cekanovskaja, O. V., 1982. The aquatic Oligochaeta of the USSR. Opred. Faune SSSR 78: 1?411 (transl. U.S. Dep. Interior Nat. Sci. Fndtn Amerind, New Delhi, 1981).
5. Clark, R. B., 1964. Dynamics in metazoan evolution. Clarendon Press, Oxford, 313 pp.