Ruhrberg, K., & Walther, I. F. (2005). Art of the 20th century. Taschen.
芝加哥风格引文Ruhrberg, Karl, 与 Ingo F. Walther. Art of the 20th Century. Hongkong: Taschen, 2005.
MLA引文Ruhrberg, Karl, 与 Ingo F. Walther. Art of the 20th Century. Taschen, 2005.
警告：这些引文格式不一定是100％准确.