in unknown hand, lower right verso in graphite: Abts: Untitled (Diagonals) WP
Kathan Brown, San Francisco; gift to NGA, 2014
- Yes, No, Maybe: Artists Working at Crown Point Press, National Gallery of Art, Washington, DC, 2013, pl. 38.1
- Brodie, Judith, and Adam Greenhalgh. Yes, No, Maybe: Artists Working at Crown Point Press. Washington, DC: National Gallery of Art, 2013, p. 146, pl. 38.1.