Gates, G. E. (1958). On some species of the Oriental earthworm genus Pheretima (Kinberg, 1867): with key to species reported from the Americas. American Museum Novitates. 1888: 1-33.
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Gates, G. E.
1958
On some species of the Oriental earthworm genus Pheretima (Kinberg, 1867): with key to species reported from the Americas