MLA

Beinecke, Edwin J. (Edwin John), 1886-1970. Stevenson, Robert Alan Mowbray (3032, 3550-3571, 8094-8095 and 8401). Box 7, folder 159. [1864?]-1894. https://collections.library.yale.edu/catalog/16609807.

APA, 6th edition

Beinecke, Edwin J. (Edwin John), 1886-1970. (["Box 7, folder 159"])([1864?]-1894)[Stevenson, Robert Alan Mowbray (3032, 3550-3571, 8094-8095 and 8401)]. https://collections.library.yale.edu/catalog/16609807.