MLA

Pettigrew, Thomas Joseph, 1791-1865. Dale, R.. Box 16, folder 732. 1834. https://collections.library.yale.edu/catalog/16684184.

APA, 6th edition

Pettigrew, Thomas Joseph, 1791-1865. (["Box 16, folder 732"])(1834)[Dale, R.]. https://collections.library.yale.edu/catalog/16684184.