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Den Hartog, C. (1968). An analysis of the Gnathorhynchidae (Neorhabdocoela, Turbellaria) and the position of Psittacorhynchus verweyi nov. gen. nov. sp. in this family. Koninklijke Nederlandse Akademie Van Wetenschappen: Hydrobiology. 71(4): 335–345.
Den Hartog, C. (1968). An analysis of the Gnathorhynchidae (Neorhabdocoela, Turbellaria) and the position of Psittacorhynchus verweyi nov. gen. nov. sp. in this family. Koninklijke Nederlandse Akademie Van Wetenschappen: Hydrobiology. 71(4): 335–345.
