MLA

Steinberg, Saul, 1914-1999. Evelyn Hofer portraits of Steinberg and Sigrid Spaeth at Amagansett residence. Box 299, folder 4485 | Box 394, folder 5216-5224. 1973. https://collections.library.yale.edu/catalog/2052770.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 299, folder 4485 | Box 394, folder 5216-5224"])(1973)[Evelyn Hofer portraits of Steinberg and Sigrid Spaeth at Amagansett residence]. https://collections.library.yale.edu/catalog/2052770.