MLA

Steinberg, Saul, 1914-1999. New World: Cartoons. Box 76, folder 1511. 1966. https://collections.library.yale.edu/catalog/16856009.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 76, folder 1511"])(1966)[New World: Cartoons]. https://collections.library.yale.edu/catalog/16856009.