APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Ruhrberg, Karl, Ingo F. Walther, Christiane Fricke, and Klaus Honnef. Art of the 20th Century. Koln: Benedikt Taschen, 1998.

MLA (8th ed.) Citation

Ruhrberg, Karl, et al. Art of the 20th Century. Benedikt Taschen, 1998.