Cite

"A Self-Portrait"

MLA

Lewis, Sinclair, 1885-1951. "A Self-Portrait". Box 39, folder 366. undated. https://collections.library.yale.edu/catalog/17116527.

APA, 6th edition

Lewis, Sinclair, 1885-1951. (["Box 39, folder 366"])(undated)["A Self-Portrait"]. https://collections.library.yale.edu/catalog/17116527.