MLA

Davis, W. W. H. (William Watts Hart), 1820-1910. Correspondence. Box 4, folder 51. 1862 Sep-Oct. https://collections.library.yale.edu/catalog/16704611.

APA, 6th edition

Davis, W. W. H. (William Watts Hart), 1820-1910. (["Box 4, folder 51"])(1862 Sep-Oct)[Correspondence]. https://collections.library.yale.edu/catalog/16704611.