Hornbeck, D. (1972). Untitled Illustration 7 (1–). https://oaks.kent.edu/node/9156
Hornbeck, Doug. 1972. “Untitled Illustration 7”. https://oaks.kent.edu/node/9156.
Hornbeck, Doug. Untitled Illustration 7. 1 Mar. 1972, https://oaks.kent.edu/node/9156.