Signature: Shuangyou daoren Tang Dingzhi
Artist's seals: 1. Seal of Tang Di (square, white characters)
2. Luoming gongsun (square, red characters)
3. How many people painted ancient pines in this world? (square, red characters)
Marking: Collectors' seals: Robert Hatfield Ellsworth (two)
Robert H. Ellsworth , New York (until 1986; donated to MMA)
Fort Worth. Kimbell Art Museum. "Style and Expressionism: Modern Chinese Painting," November 4, 1989–January 14, 1990.