Cite

[head of a woman, superimposed over a group of 3 people with a dog]

MLA

Stein, Gertrude, 1874-1946. [head of a woman, superimposed over a group of 3 people with a dog]. Box 162, folder 4269. n.d.. https://collections.library.yale.edu/catalog/10108609.

APA, 6th edition

Stein, Gertrude, 1874-1946. (["Box 162, folder 4269"])(n.d.)[[head of a woman, superimposed over a group of 3 people with a dog]]. https://collections.library.yale.edu/catalog/10108609.