MLA

Steinberg, Saul, 1914-1999. Untitled [Concert pianist in tails with hatch-mark music; Concert pianist in tails with heavily hatched marked music]. Box 375, folder 5057. 1954. https://collections.library.yale.edu/catalog/16854829.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 375, folder 5057"])(1954)[Untitled [Concert pianist in tails with hatch-mark music; Concert pianist in tails with heavily hatched marked music]]. https://collections.library.yale.edu/catalog/16854829.