A critical account of the drawings by Michel Angelo and Raffaello in the University Galleries, Oxford (1870)
Robinson, J. C · Oxford : Clarendon Press · leaf 330
sides this, however, the finished drawing of the whole composition, from which the engraving seems to have been made, is still extant (in the [collection of Mr. Gatteaux of Paris) ; and this, being certainly [from the hand of Giulio, places the original authorship of the fpresent design beyond…