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. 174.
- 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. 88, repro.
- Works of Art from the Widener Collection. Foreword by David Finley and John Walker. National Gallery of Art, Washington, 1942: 15.
- Martinez, Trinity. "A Newly Discovered Textual Source for the Master of the Orpheus Legend's Chiron Plaquettes." Source: Notes in the History of Art 37 (Fall 2017): 15-25, fig. 2.
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