Cite

Recto: list of names and numbers; verso: numerical calculations

MLA

Kilpatrick, Jack Frederick (1915-1967). Recto: list of names and numbers; verso: numerical calculations. Box 5, folder 428. undated. https://collections.library.yale.edu/catalog/15492348.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 5, folder 428"])(undated)[Recto: list of names and numbers; verso: numerical calculations]. https://collections.library.yale.edu/catalog/15492348.