MLA

Stevens, Isaac Ingalls, 1818-1862. Copy of letter to Colonel Shaw. Feb 21, 1856, with note to Governor Stevens added by Lieutenant Brackett, Q.M. Clerk. 1 p.. Box 2, folder 47. 1848 1857. https://collections.library.yale.edu/catalog/16697950.

APA, 6th edition

Stevens, Isaac Ingalls, 1818-1862. (["Box 2, folder 47"])(1848 1857)[Copy of letter to Colonel Shaw. Feb 21, 1856, with note to Governor Stevens added by Lieutenant Brackett, Q.M. Clerk. 1 p.]. https://collections.library.yale.edu/catalog/16697950.