1. Brinkhurst, R. O. & B. G. M. Jamieson, 1971. Aquatic Oligochaeta of the World. Oliver & Boyd, Edinburgh. 860 pp.
2. Cernosvitov, L., 1937. System der Enchytraeiden. Zap. nauchnoissled. Ob'ed. russk. svob. Univ. Prage 5: 262?295.
3. Coates, K. A. & D. V. Ellis, 1980. Enchytraeid oligochaetes as marine pollution indicators. Mar. Pollut. Bull. 11: 171?174.
4. Coates, K. A. & C. Ers�us, 1980. Two species of Grania (Oligochaeta, Enchytraeidae) from British Columbia. Can. J. Zool. 58: 1037?1041.
5. Eisen, G., 1904. Enchytraeidae of the west coast of North America. In Harriman Alaska expedition series. Vol. XII. Annelida. Smithsonian Institution, New York, pp. 1?166.