MLA

Whitman, Walt, 1819-1892. James R. Osgood and Company. Box 1, folder 4. 1881. https://collections.library.yale.edu/catalog/2053638.

APA, 6th edition

Whitman, Walt, 1819-1892. (["Box 1, folder 4"])(1881)[James R. Osgood and Company]. https://collections.library.yale.edu/catalog/2053638.