MLA

Marsh, Othniel Charles, 1831-1899. Red Cloud Correspondence. Box 52, folder 13. 1875 June 17-30. https://collections.library.yale.edu/catalog/32510107.

APA, 6th edition

Marsh, Othniel Charles, 1831-1899. (["Box 52, folder 13"])(1875 June 17-30)[Red Cloud Correspondence]. https://collections.library.yale.edu/catalog/32510107.