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→Primary sources
==Primary sources ==
==Primary sources ==
Six works have been attributed to Thomas of Erfurt.
* ''Tractatus de modis significandi seu Grammatica speculativa'' (ed. Bursill-Hall 1972),
* Commentary on Porphyry's ''Isagoge''
* Commentary on Aristotle's ''Categories''
* Commentary on Aristotle's ''De interpretatione''
* Commentary on ''Liber sex principiorum'' (Book of Six Principles).
* Commentary on Commentarius in carmen ‘Fundamentum puerorum’ (ed. Gansiniec 1960), although its editor believes that it is actually an anonymous abridgement of De modis significandi.
Thomas's entire reputation derives from ''De modis significandi'', which remains his only work to have been studied in any detail.
==Secondary sources ==
==Secondary sources ==