Keen, G. (1971). The sale of works of art: A study based on the Times-Sotheby Index. Nelson.
芝加哥风格引文Keen, Geraldine. The Sale of Works of Art: A Study Based on the Times-Sotheby Index. [London]: Nelson, 1971.
MLA引文Keen, Geraldine. The Sale of Works of Art: A Study Based on the Times-Sotheby Index. Nelson, 1971.
警告：这些引文格式不一定是100％准确.