Cite

Original watercolor by HY Fournier. [4239-1]

MLA

Marinetti, F. T., 1876-1944. Original watercolor by HY Fournier. [4239-1]. box 54, slide 19. no date. https://collections.library.yale.edu/catalog/10655459.

APA, 6th edition

Marinetti, F. T., 1876-1944. (["box 54, slide 19"])(no date)[Original watercolor by HY Fournier. [4239-1]]. https://collections.library.yale.edu/catalog/10655459.