MLA

Curtis, Samuel Ryan, 1805-1866. Telegram to Captain F. S. Winslow. April 19, 1862; letter, April 20, 1862. 3 p.. Box 1, folder 4. 1846-1866. https://collections.library.yale.edu/catalog/14462284.

APA, 6th edition

Curtis, Samuel Ryan, 1805-1866. (["Box 1, folder 4"])(1846-1866)[Telegram to Captain F. S. Winslow. April 19, 1862; letter, April 20, 1862. 3 p.]. https://collections.library.yale.edu/catalog/14462284.