I. R.  Ball, ?A contribution to the phylogeny and biogeography of the freshwater triclads (Platyhelminthes, Turbellaria)?, in Biology of the Turbellaria, New York: McGraw-Hill, 1974, pp. 339-401.

E. J.  De Vries, ?The biogeography of the genus Dugesia (Turbellaria, Tricladida, Paludicola) in the Mediterranean region?, Journal of Biogeography, vol. 12, pp. 509-518, 1985.