MLA

Schletter, Annie, 1858-1944. "Flanders" Almanac. Box 2, folder 84. 1916. https://collections.library.yale.edu/catalog/17453755.

APA, 6th edition

Schletter, Annie, 1858-1944. (["Box 2, folder 84"])(1916)["Flanders" Almanac]. https://collections.library.yale.edu/catalog/17453755.