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(en) Olson, H.W., 1936. Earthworms of Missouri. The Ohio Journal of Science, 36 (2): 102-113. Earthworms of Missouri. Gearchiveerd op 25 juni 2007.
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(en) Blakemore, R., 2007. An updated list of valid, invalid and synonymous names of Criodriloidea (Criodrilidae) and Lumbricoidea (Annelida: Oligochaeta: Sparganophilidae, Ailoscolecidae, Hormogastridae, Lumbricidae, and Lutodrilidae). COE, Soil Ecology Group, Graduate School of Environment and Information Sciences, Yokohama National University, Yokohama, Japan. 48 pp. [1].
(en) Olson, H.W., 1936. Earthworms of Missouri. The Ohio Journal of Science, 36 (2): 102-113. Earthworms of Missouri. Gearchiveerd op 25 juni 2007.