MLA

Davis, W. W. H. (William Watts Hart), 1820-1910. Private Journal of the attack on Charlestown, South Carolina, by W. W. H. Davis, Colonel, 104th Pennsylvania Volunteers, Commander of 1st Brigade, 2nd Division, 18th Army Corps. Box 8, folder 93. 1863 Apr. https://collections.library.yale.edu/catalog/17200220.

APA, 6th edition

Davis, W. W. H. (William Watts Hart), 1820-1910. (["Box 8, folder 93"])(1863 Apr)[Private Journal of the attack on Charlestown, South Carolina, by W. W. H. Davis, Colonel, 104th Pennsylvania Volunteers, Commander of 1st Brigade, 2nd Division, 18th Army Corps]. https://collections.library.yale.edu/catalog/17200220.