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Sims, R. W.; Easton, E. G. (1972). A numerical revision of the earthworm genus Pheretima auct.(Megascolecidae: Oligochaeta) with the recognition of new genera and an appendix on the earthworms collected by the Royal Society North Borneo Expedition. Biological Journal of the Linnean Society. 4(3): 169-268.
Sims, R. W.; Easton, E. G. (1972). A numerical revision of the earthworm genus Pheretima auct.(Megascolecidae: Oligochaeta) with the recognition of new genera and an appendix on the earthworms collected by the Royal Society North Borneo Expedition. Biological Journal of the Linnean Society. 4(3): 169-268.
