lower left in graphite: 87/250; lower center in graphite: Some Ingredients; lower right in graphite: Paul Landacre
- Lehman, Anthony L. Paul Landacre: A Life and a Legacy. Los Angeles, CA: Dawson's Book Shop, 1983, p. 167, no. 127.
- Czestochowski, Joseph S. James Swann: In Quest of a Printmaker, with Presentation Prints of the Chicago Society of Etchers, Prairie Print Makers, and the Woodcut Society. Iowa: Cedar Rapids Museum of Art, 1990, appendix C, p. 154, no. 43.