Cite

Watt, Henry. Letter to Theodore Roosevelt (in English)

MLA

Kilpatrick, Jack Frederick (1915-1967). Watt, Henry. Letter to Theodore Roosevelt (in English). Box 11, folder 991. 1905 January. https://collections.library.yale.edu/catalog/15493796.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 11, folder 991"])(1905 January)[Watt, Henry. Letter to Theodore Roosevelt (in English)]. https://collections.library.yale.edu/catalog/15493796.