Untitled [Ex-voto: Horse and rider]
MLA
Steinberg, Saul, 1914-1999. Untitled [Ex-voto: Horse and rider]. Box 367, folder 4911. undated. https://collections.library.yale.edu/catalog/16857133.
APA, 6th edition
Steinberg, Saul, 1914-1999. (["Box 367, folder 4911"])(undated)[Untitled [Ex-voto: Horse and rider]]. https://collections.library.yale.edu/catalog/16857133.