Cite

Irwin, Capt.

MLA

Pettigrew, Thomas Joseph, 1791-1865. Irwin, Capt.. Box 17, folder 843. n.d.. https://collections.library.yale.edu/catalog/16684185.

APA, 6th edition

Pettigrew, Thomas Joseph, 1791-1865. (["Box 17, folder 843"])(n.d.)[Irwin, Capt.]. https://collections.library.yale.edu/catalog/16684185.