MLA

Faulk, Andrew Jackson, 1814-1898. Photos: military identifications. Box 2, folder 25. n.d.. https://collections.library.yale.edu/catalog/2008525.

APA, 6th edition

Faulk, Andrew Jackson, 1814-1898. (["Box 2, folder 25"])(n.d.)[Photos: military identifications]. https://collections.library.yale.edu/catalog/2008525.