MLA

Stieglitz, Alfred, 1864-1946. Caricatures of Photo-Secession members. Box 149, folder 2783. n.d.. https://collections.library.yale.edu/catalog/2032698.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 149, folder 2783"])(n.d.)[Caricatures of Photo-Secession members]. https://collections.library.yale.edu/catalog/2032698.