Cite

Kurtz, W[illiam?]

MLA

Whitman, Walt, 1819-1892. Kurtz, W[illiam?]. Box 4, folder 181. 1879 May. https://collections.library.yale.edu/catalog/2053812.

APA, 6th edition

Whitman, Walt, 1819-1892. (["Box 4, folder 181"])(1879 May)[Kurtz, W[illiam?]]. https://collections.library.yale.edu/catalog/2053812.