Joseph Beuys : A series of 90 paintings, 2 Schafsköpfe (Loch) 1961-1975, Painting version 1-90.

MLA

Joseph Beuys : A Series of 90 Paintings, 2 Schafsköpfe (loch) 1961-1975, Painting Version 1-90. 63/500 ex. (gesigneerd en genummerd) München: Verlag Schellmann & Klüser, 1976.

APA

(1976). Joseph Beuys : A series of 90 paintings, 2 Schafsköpfe (Loch) 1961-1975, Painting version 1-90. 63/500 ex. (gesigneerd en genummerd) München: Verlag Schellmann & Klüser.

Chicago

Joseph Beuys: A Series of 90 Paintings, 2 Schafsköpfe (loch) 1961-1975, Painting Version 1-90. 63/500 ex. (gesigneerd en genummerd) München: Verlag Schellmann & Klüser, 1976.