T. G.  Karling, ?Zur Frage von dem systematischen Wert der Kategorien Archoophora und Neoophora (Turbellaria).?, Comment Biol Soc Scien Fenn, vol. 30, 1967.

T. G.  Karling, ?On the anatomy and affinities of the turbellarian orders.?, in Biology of the Turbellaria , New York: McGraw-Hill, 1974, pp. 1-16.

T. G.  Karling, ?Zur Morphologie und Systematik der Alloeocoela Cumulata und Rhabdocoela Lecithophora (Turbellaria).?, Acta zool fenn, vol. 26, pp. 1 - 260, 1940.

T. G.  Karling, ?Turbellarian fauna of the Baltic proper. Identification, ecology and biogeography.?, Fauna Fenn, vol. 27, pp. 1 - 101, 1974.

T. G.  Karling, Mack-Fira, V., and Dörjes, J., ?First report on marine microturbellarians from Hawaii.?, Zool Scr, vol. 1, pp. 251 - 269, 1972.

J.  Dörjes and Karling, T. G., ?Species of Turbellaria Acoela in the Swedish Museum of Natural History, with remarks on their anatomy, taxonomy and distribution.?, Zool Scr, vol. 4, pp. 175 - 189, 1975.