Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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