Cita APA (7th ed.)

Keen, G. (1971). The sale of works of art: A study based on the Times-Sotheby Index. Nelson.

Cita Chicago (17th ed.)

Keen, Geraldine. The Sale of Works of Art: A Study Based on the Times-Sotheby Index. [London]: Nelson, 1971.

Cita MLA (9th ed.)

Keen, Geraldine. The Sale of Works of Art: A Study Based on the Times-Sotheby Index. Nelson, 1971.