lower left in plate: GROPPER.; lower right in graphite: GROPPER.; lower right edge in graphite by unknown hand: Estabrook
- Windisch, Gail, and Sylvan Cole, Jr. Art for Every Home: An Illustrated Index of Associated American Artists Prints, Ceramics, and Textile Designs. Manhattan: Marianna Kistler Beach Museum of Art, Kansas State University, 2016, p. 101, no. 895.