Darwin, C. (1881) The Formation of Vegetable Mould through the Action of Worms, with Observations of their Habits. Murray, London. https://doi.org/10.5962/bhl.title.107559
Edwards, C.A. and Lofty, J.R. (1972) Biology of Earthworms. Chapman and Hall, London. https://doi.org/10.1007/978-1-4899-6912-5
Edwards, C.A. and Lofty, J.R. (1977) Biology of Earthworms. 2nd Edition. Chapman and Hall, London. https://doi.org/10.1007/978-1-4613-3382-1
Edwards, C.A., and Neuhauser, E.F. (Eds.) (1988) Earthworms in Waste and Environmental
Management. SPB Academic Publishing. The Hague, the Netherlands.
Edwards, C.A. and Bohlen, P.J. (1996) Biology and Ecology of Earthworms. 3rd Edition. Chapman and Hall, London.
Edwards, C.A., Arancon, N.Q. & Sherman R. (Eds.) (2011) Vermiculture Technology: Earthworms, Organic Wastes, and Environmental Management. CRC Press. Taylor & Francis Group. Boca Raton, Florida.
Jamieson B.G.M. (1988) On the phylogeny and higher classification of the Oligochaeta. Cladistics 4 (4) 367–401. https://doi.org/10.1111/j.1096-0031.1988.tb00520.x
Satchell, J. (1992) Take the money-call the tune. Soil Biology and Biochemistry 24 (12),1193–1196. https://doi.org/10.1016/0038-0717(92)90092-C
Stephenson, J. (1930) The Oligochaeta. Oxford University Press.