APA (7e ed.) Bronvermelding

Ruhrberg, K., & Walther, I. F. (1998). Art of the 20th century. Taschen.

Chicago (17e ed.) Bronvermelding

Ruhrberg, Karl, en Ingo F. Walther. Art of the 20th Century. Kèoln, New York: Taschen, 1998.

MLA (9e ed.) Bronvermelding

Ruhrberg, Karl, en Ingo F. Walther. Art of the 20th Century. Taschen, 1998.