Beuys, J., Rose, B., Koepplin, D., & Temkin, A. (1993). Thinking is form: The drawings of Joseph Beuys / Ann Temkin and Bernice Rose with a contribution by Dieter Koepplin. Philadelphia Museum of Art [u.a.].

Beuys, Joseph, Bernice Rose, Dieter Koepplin, and Ann Temkin. Thinking Is Form: The Drawings of Joseph Beuys / Ann Temkin and Bernice Rose with a Contribution by Dieter Koepplin. Philadelphia, Pa.: Philadelphia Museum of Art [u.a.], 1993.

Beuys, Joseph, et al. Thinking Is Form: The Drawings of Joseph Beuys / Ann Temkin and Bernice Rose with a Contribution by Dieter Koepplin. Philadelphia Museum of Art [u.a.], 1993.