MLA

Platner, Warren, 1919-2006. Slides. Box 11 | Box 12. 1971. https://collections.library.yale.edu/catalog/10021299.

APA, 6th edition

Platner, Warren, 1919-2006. (["Box 11 | Box 12"])(1971)[Slides]. https://collections.library.yale.edu/catalog/10021299.