MLA

Pearson, Norman Holmes, 1909-1975. Porter, Katherine Anne, [Caricature of Elinor Wylie], ink on paper (1980.131.7). Box 2 (Oversize), folder 21. 1927. https://collections.library.yale.edu/catalog/2003215.

APA, 6th edition

Pearson, Norman Holmes, 1909-1975. (["Box 2 (Oversize), folder 21"])(1927)[Porter, Katherine Anne, [Caricature of Elinor Wylie], ink on paper (1980.131.7)]. https://collections.library.yale.edu/catalog/2003215.