MLA

Geldzahler, Henry, 1935-1994. DIA: approximately 20 pages typed business correspondence; reports and budgets regarding Dia at Bridgehampton, N.Y. clippings, Sotheby's catalog - "23 Works from DIA: NY, November 5 '85". Box 7, folder 261. 1985. https://collections.library.yale.edu/catalog/17185208.

APA, 6th edition

Geldzahler, Henry, 1935-1994. (["Box 7, folder 261"])(1985)[DIA: approximately 20 pages typed business correspondence; reports and budgets regarding Dia at Bridgehampton, N.Y. clippings, Sotheby's catalog - "23 Works from DIA: NY, November 5 '85"]. https://collections.library.yale.edu/catalog/17185208.