Béla Bartók: Seven Sketches, op. 9. New York, ©1950, E. B. Marks Music Corp. No. 12726–13, 3. (excerpt of Bartók’s introduction to a planned album of his piano works, ca 1945)
Edition of the complete introduction: Béla Bartók’s Early Piano Works. Ed. Peter Bartók. Homossassa, Florida, ©2010 Bartók Records BR 708, III.
Collected edition: Essays, 432–433; BBI/1, 94–95.
Source: BBA