MLA

Steinberg, Saul, 1914-1999. Alphabet Travels. Box 539 (Oversize), folder 7281. 1964. https://collections.library.yale.edu/catalog/33092027.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 539 (Oversize), folder 7281"])(1964)[Alphabet Travels]. https://collections.library.yale.edu/catalog/33092027.