The Frick Art Reference Library & Helen Clay Frick.
The Frick collection: an illustrated catalogue of works of art in the collection of Henry Clay Frick. Vols. 1-3.
R674130. The Frick collection: an illustrated catalogue of works of art in the collection of Henry Clay Frick. Vols. 1-3. By The Frick Art Reference Library & Helen Clay Frick. © 19Dec49; A39375. The Frick Art Reference Library (PCW); 12Oct77; R674130.
The Frick Art Reference Library|PCW