Cite

Hartmann, Sadakichi to "Dr. Wiksell"

MLA

Whitman, Walt, 1819-1892. Hartmann, Sadakichi to "Dr. Wiksell". Box 2, folder 97. 1920 Apr 23. https://collections.library.yale.edu/catalog/2053731.

APA, 6th edition

Whitman, Walt, 1819-1892. (["Box 2, folder 97"])(1920 Apr 23)[Hartmann, Sadakichi to "Dr. Wiksell"]. https://collections.library.yale.edu/catalog/2053731.