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- Sims, R & Gerard, B (1985). Earthworms: Keys and Notes for the Identification and Study of the Species. London: Published for The Linnean Society of London and the Estuarine and Brackish-Water Sciences Association by E. J. Brill/Dr. W. Backhuys. p. 3.
- Fox, Richard. "Invertebrate Anatomy OnLine". Lander University. Retrieved May 13, 2012.
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