MLA

Meserve, Frederick Hill, 1865-1962. Willis, Oscar, 1843-1881, as a character in an unidentified theatrical production. Box 171, folder 13653. approximately 1875. https://collections.library.yale.edu/catalog/16198652.

APA, 6th edition

Meserve, Frederick Hill, 1865-1962. (["Box 171, folder 13653"])(approximately 1875)[Willis, Oscar, 1843-1881, as a character in an unidentified theatrical production]. https://collections.library.yale.edu/catalog/16198652.