Cite

(31) Prisoners' military drill

MLA

Pratt, Richard Henry, 1840-1924. (31) Prisoners' military drill. Box 32. 1862-1972. https://collections.library.yale.edu/catalog/2001786.

APA, 6th edition

Pratt, Richard Henry, 1840-1924. (["Box 32"])(1862-1972)[(31) Prisoners' military drill]. https://collections.library.yale.edu/catalog/2001786.