books.google.co.ukhttp://books.google.co.uk/books/about/Portiforii_seu_Breviarii_Sarisburiensis.html?id=yWUVAAAAQAAJ&q=exaudi&utm_source=gb-gplus-sharePortiforii seu Breviarii Sarisburiensis fasciculus primus (secundus, ed. C. Seager). (Eccles. Angl. officia antiqua).
