MLA

Beinecke, Edwin J. (Edwin John), 1886-1970. "Cruelty to Animals" (6131). Box 28, folder 652. undated. https://collections.library.yale.edu/catalog/16609849.

APA, 6th edition

Beinecke, Edwin J. (Edwin John), 1886-1970. (["Box 28, folder 652"])(undated)["Cruelty to Animals" (6131)]. https://collections.library.yale.edu/catalog/16609849.