Cite

The first sketch for the concerto coalitionale & infernale, unpublished [graphic]

MLA

Sayers, James, 1748-1823, printmaker. The first sketch for the concerto coalitionale & infernale, unpublished [graphic]. [25 April 1785]. https://collections.library.yale.edu/catalog/10727985.

APA, 6th edition

Sayers, James, 1748-1823, printmaker. ([25 April 1785])[The first sketch for the concerto coalitionale & infernale, unpublished [graphic]]. https://collections.library.yale.edu/catalog/10727985.