MLA

Gissing, George, 1857-1903. ALS to Joseph Anderson, Eversley, Epson. Box 10, folder 169. [18]96 Apr 28. https://collections.library.yale.edu/catalog/16495598.

APA, 6th edition

Gissing, George, 1857-1903. (["Box 10, folder 169"])([18]96 Apr 28)[ALS to Joseph Anderson, Eversley, Epson]. https://collections.library.yale.edu/catalog/16495598.