extensive fifteenth-century text in brown ink
(sale, Christie's London, 7 November 1993, no. 121A, as South German). (Jörn Günther, Hamburg); purchased 2003 by NGA.
- Six Centuries of Prints and Drawings: Recent Acquisitions, National Gallery of Art, Washington, D.C., 2004 - 2005
- Koreny, F., in The Touch of the Artist: Master Drawings from the Woodner Collections. Ed. M. M. Grasselli. Washington, D.C., 1995: 98-99, fig. 7.