Oscar Hainauer [d. 1894], Berlin; his wife, Julie Hainauer, Berlin; acquired 1906 by (Duveen Brothers, Inc., London and New York); by exchange 21 October 1920 to Joseph E. Widener, Lynnewood Hall, Elkins Park, Pennsylvania; gift 1942 to NGA.
- Molinier, Émile. Les Bronzes de la Renaissance. Les Plaquettes; Catalogue Raisonné. 2 vols. Paris, 1886: 2:28, no. 369, as Paduan school (school of Donatello).
- Bode, Wilhelm von, ed. Die Sammlung Oscar Hainauer / The Collection of Oscar Hainauer. [bound as one volume, English and German pages interleaved in one page sequence] Berlin, 1897 and London, 1906: no. 161 (Plaquette no. 20), as Paduan, c. 1450.
- A Cabinet of One Hundred & Thirty-Three Bronze Plaques and Medals of the Renaissance Period from the Collection of the Late Herr Oscar Hainauer of Berlin. Ed. Duveen Brothers. London, n.d. (but 1908): no. 95, repro., as Paduan, c.1450.
- Works of Art from the Widener Collection. Foreword by David Finley and John Walker. National Gallery of Art, Washington, 1942: 15.
- Rossi, Francesco. La collezione Mario Scaglia: placchette. 3 vols. Bergamo, 2011: 1:76, under Variante E, C.36, as part of the Hainauer Collection.