MLA

Bahlmann, Anna Catherine, 1849-1916. Postcard albums. Box 5, folder 67-116. 1909-1910, undated. https://collections.library.yale.edu/catalog/2111630.

APA, 6th edition

Bahlmann, Anna Catherine, 1849-1916. (["Box 5, folder 67-116"])(1909-1910, undated)[Postcard albums]. https://collections.library.yale.edu/catalog/2111630.