Cite

Photographer working in field, Germany, photographic postcard

MLA

Stieglitz, Alfred, 1864-1946. Photographer working in field, Germany, photographic postcard. Box 144, folder 2664. ca. 1890. https://collections.library.yale.edu/catalog/17357458.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 144, folder 2664"])(ca. 1890)[Photographer working in field, Germany, photographic postcard]. https://collections.library.yale.edu/catalog/17357458.