MLA

Gascoyne, David, 1916-2001. "Impacts," drawing, signed. Box 17, folder 361. 1963. https://collections.library.yale.edu/catalog/2055208.

APA, 6th edition

Gascoyne, David, 1916-2001. (["Box 17, folder 361"])(1963)["Impacts," drawing, signed]. https://collections.library.yale.edu/catalog/2055208.