MLA

Stein, Leo, 1872-1947. [Landscape]. Box 17, folder 441. n.d.. https://collections.library.yale.edu/catalog/32446909.

APA, 6th edition

Stein, Leo, 1872-1947. (["Box 17, folder 441"])(n.d.)[[Landscape]]. https://collections.library.yale.edu/catalog/32446909.