Patterson, W. P. (1998). How the Enneagram Came to Market. Taking with the left hand, 21-46.
芝加哥风格引文Patterson, William Patrick. "How the Enneagram Came to Market." Taking with the Left Hand 1998: 21-46.
MLA引文Patterson, William Patrick. "How the Enneagram Came to Market." Taking with the Left Hand, 1998, pp. 21-46.
警告：这些引文格式不一定是100％准确.