Cita APA (7a ed.)

Ruhrberg, K., & Walther, I. F. (2005). Art of the 20th century. Taschen.

Cita Chicago Style (17a ed.)

Ruhrberg, Karl, y Ingo F. Walther. Art of the 20th Century. Hongkong: Taschen, 2005.

Cita MLA (9a ed.)

Ruhrberg, Karl, y Ingo F. Walther. Art of the 20th Century. Taschen, 2005.