Keen, G. (1971). The sale of works of art: A study based on the Times-Sotheby Index. Nelson.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKeen, Geraldine. The Sale of Works of Art: A Study Based on the Times-Sotheby Index. [London]: Nelson, 1971.
एमएलए (9वां संस्करण) प्रशस्ति पत्रKeen, Geraldine. The Sale of Works of Art: A Study Based on the Times-Sotheby Index. Nelson, 1971.
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