MLA

Bahlmann, Anna Catherine, 1849-1916. Manuscript fragments. Box 5, folder 58. undated. https://collections.library.yale.edu/catalog/2109435.

APA, 6th edition

Bahlmann, Anna Catherine, 1849-1916. (["Box 5, folder 58"])(undated)[Manuscript fragments]. https://collections.library.yale.edu/catalog/2109435.