MLA

Forsyth, James W. (James William), 1836-1906. Cincinnati, Ohio. Box 5, folder 92. 1862, n.d.. https://collections.library.yale.edu/catalog/2042872.

APA, 6th edition

Forsyth, James W. (James William), 1836-1906. (["Box 5, folder 92"])(1862, n.d.)[Cincinnati, Ohio]. https://collections.library.yale.edu/catalog/2042872.