Cite

Weir, John Ferguson (to unidentified correspondents)(6)

MLA

Weir, John F. (John Ferguson), 1841-1926. Weir, John Ferguson (to unidentified correspondents)(6). Box 5, folder 132. undated. https://collections.library.yale.edu/catalog/10021216.

APA, 6th edition

Weir, John F. (John Ferguson), 1841-1926. (["Box 5, folder 132"])(undated)[Weir, John Ferguson (to unidentified correspondents)(6)]. https://collections.library.yale.edu/catalog/10021216.