MLA

Hansen, Bert, 1944-. "A Hopeless Mésalliance. Matchmaker Sherman 'I've done my best to keep 'em united, but it's no use--it's a case of utter incompatibility'!". Box 10, folder 17. 1893 January 4. https://collections.library.yale.edu/catalog/32331611.

APA, 6th edition

Hansen, Bert, 1944-. (["Box 10, folder 17"])(1893 January 4)["A Hopeless Mésalliance. Matchmaker Sherman 'I've done my best to keep 'em united, but it's no use--it's a case of utter incompatibility'!"]. https://collections.library.yale.edu/catalog/32331611.