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.
- 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. 179.
- 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. 12, repro.
- Works of Art from the Widener Collection. Foreword by David Finley and John Walker. National Gallery of Art, Washington, 1942: 15.
- Lewis, Douglas. "The Plaquettes of 'Moderno' and His Followers." Studies in the History of Art 22 (1989): 107-108, fig. 2; 140, no. I.2.
- Avery, Charles, Marzia Ratti, and Angela Acordon, eds. Sculture: bronzetti, placchette, medaglie. Museo Civico Amedeo Lia, La Spezia. [Cinisello Balsamo], 1998: 272, no. 192.