Haereses et errores domini Iohannis Purvey sacerdotis, extracti de libello suo haeretico

Datierung nach Anne Hudson. [Vgl. Green (2004); S. 363.]

• Green, Richrd Firth: "John Purvey and John of Gaunt's third Marriage", S. 363-70, in: Medieval Studies 66 (2004).