APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Ruhrberg, Karl, and Ingo F. Walther. Art of the 20th Century. Koln: Taschen, 1998.

MLA (9th ed.) Citation

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