Template:Ball, 1974a
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- Ball, I.R. 1974. A Contribution to the Phytogeny and Biogeography of the Freshwater Triclads (Platyhelminthes: Turbellaria). pp. 339–401 in Riser, N.W. & Morse, M.P.: Biology of the Turbellaria. New York : McGraw-Hill Book Company.