MLA

Miller, William Winlock, 1822-1876. Poe, A.. Box 4, folder 240. 1853-59, n.y.. https://collections.library.yale.edu/catalog/16700891.

APA, 6th edition

Miller, William Winlock, 1822-1876. (["Box 4, folder 240"])(1853-59, n.y.)[Poe, A.]. https://collections.library.yale.edu/catalog/16700891.